Deir Ezzor airport, seen here in 2013, has been a key location for battles throughout the Syrian civil war
(
AFP/Getty Images
)
Isis has reportedly used mustard gas against Bashar al-Assad’s forces in battles at a key airport in eastern Syria.
Militants were attempting to recapture Deir ez-Zor military airport when they deployed the chemical weapon on Monday, state media said.
Syrian television did not disclose how many casualties were sustained in the latest drive by the so-called Islamic State in the city, which is mainly under the group’s control, as is the surrounding countryside.
A map showing reported battles in Deir Ezzor on 5 April 2016. The red area denotes Syrian government control, while the grey is Isis. (Liveuamap)
“The terrorists fired rockets carrying mustard gas,” said a statement said on the state-owned Ikhbariyah television station.
Deir ez-Zor’s airport has been a key flashpoint of battles between Isis, rival rebel groups and regime forces throughout the Syrian civil war.
The strategic city lies on vital routes linking the so-called Islamic State’s territories in western and northern Syria, including Raqqa, with Iraq.
Reports of mustard gas could not be independently verified but Kurdish and Turkmen groups have reported its use before.
Turkmen rebels reported mustard gas shelling in northern Iraq last month and the Organisation for the Prohibition of Chemical Weapons (OPCW) confirmed that the weapon killed a baby as Isis battled rebels in the Syrian town of Marea in August.
A man breathes with aid of an oxygen mask following a mustard gas attack in Idlib, Syria (AFP)
The head of an Isis unit attempting to develop chemical weapons was reportedly captured by American special forces earlier this year and was being questioned in Iraq.
The US has confirmed the group's use of mustard gas, which is believed to have been weaponised in a powdered form carried by artillery shells at strengths capable of maiming victims rather than killing them outright.
Amaq News Agency, which publishes Isis propaganda, released footage of the latest battles at Deir ez-Zor airport on Monday.
The videos have since been removed but supporters hailed the deaths of “hypocrites and apostates”.
A statement said militants launched an attack on al-Juffrah village, next to the airfield, in which it said two of its suicide bombers rammed their vehicles into army defences causing “tens of dead”.
“The battles continue on more than front and posts and we pray to Allah victory for his Mujahdeen (holy warriors),” Isis said.
The UK-based Syrian Observatory for Human Rights said jihadists had advanced under heavy bombardment aimed at repelling their offensive, reporting casualties on both sides.
An Isis media officer for the area, which the group calls “Wilayat al-Khayr”, was said to be among those killed by air strikes.
The state-controlled Syrian Arab News Agency said operations continued in Deir ez-Zor near al-Juffrah and anther village called al-Bogheiliyeh on Tuesday.
It hailed “foiled” Isis attacks on the airport, reporting claims that the group’s vehicles and weaponry were destroyed and several militants killed.
Timeline: The emergence of Isis
Timeline: The emergence of Isis
1/40 2000
Abu Musab al-Zarqawi (pictured here) forms an al-Qaeda splinter group in Iraq, al-Qa’eda in Iraq. Its brutality from the beginning alienates Iraqis and many al-Qaeda leaders.
2/40 2006
Al-Zarqawi is killed in a U.S. strike. Al-Zarqawi’s successor, Abu Ayyub al-Masri, announces the creation of the Islamic State in Iraq (ISI).
Reuters
3/40 2009
Still al-Qaeda-linked ISI claims responsibility for suicide bombings that killed 155 in Baghdad, as well as attacks in August and October killing 240, as President Obama announces troop withdrawal from Iraq in March.
Getty Images
4/40 2010
Abu Bakr al-Baghdadi becomes head of ISI, at lowest ebb of Islamist militancy in Iraq, which sees last U.S. combat brigade depart.
5/40 2012
In Syria, protests (pictured here starting in Daree) have morphed into what president Assad labelled a “real war” with emergence of a coalition of forces opposed to Assad’s regime. Syria group Jabhat al-Nusra are among rebel groups who refuse to join, denouncing it as a “conspiracy”.
Bombings targeting Shia areas, killing more than 500 people, spark fears of new sectarian conflict. Sunni Muslims stage protests across country against what they see as increasingly marginalisation by Shia-led government.
AP
6/40 2013
Al-Baghdadi renames ISI as the Islamic State in Iraq and Syria, or Isis, as the group absorbs Syrian al-Nusra, gaining a foothold in Syria.
In response, al-Qaeda chief Ayman al-Zawahiri (Bin Laden’s successor) concerned about Isis’ expansion orders that Isis be dissolved and ISI operations should be confined to Iraq. This order is rejected by al-Baghdadi.
AFP
7/40 2014 - January
Isis fighters capture the Iraqi cities of Fallujah and Ramadi, giving them base to launch slew of attacks further south.
AP
8/40 2014 - June
Isis declares itself the Caliphate, calling itself Islamic State (IS). The group captures Mosul, Iraq’s second largest city; Tal Afar, just 93 miles from Syrian border; and the central Iraqi city of Tikrit. These advances sent shockwaves around the world.
9/40 2014 - June
Around the same time Isis releases a video calling for western Muslims to join the Caliphate and fight, prompting new evaluations of extremists groups social media understanding.
10/40 2014 - June
Isis take Baiji oil fields in Iraq - giving them access to huge amounts of possible revenue.
EPA
11/40 2014 - August
James Foley is executed by the group as concerns grow for second American prisoner, fellow reporter Steven Sotloff.
AP
12/40 2014 - August
Obama authorises U.S. airstrikes in Iraq, helping to stall Isis’ along with action by Kurdish forces following the deaths of hundreds of Yazidi people on Mount Sinjar.
13/40 2014 - September
Isis release video showing Steven Sotloff’s murder prompting Western speculation his executioner is same man who killed Mr Foley.
EPA
14/40 2014 - September
Obama tells us that America “will hunt down terrorists who threaten our country”
EPA
15/40 2014 - September
Isis release a video appearing to show David Haines, who was captured by militants in Syria in 2013, wearing an orange jumpsuit and kneeling in the desert while he reads a pre-prepared script. It later shows what appears to be the aid worker's body.
Rex
16/40 2014 - September
Peshmerga fighters scrabble to hold positions in the Diyala province (a gateway to Baghdad) as Isis fighters continue to advance on Iraqi capital.
AFP
17/40 2014 - October
Aid worker Alan Henning is killed. Self-imposed media blackout refuses to show images of him in final moments, instead focuses upon humanitarian care.
AP
18/40 2014 - October
Isis raise their flag in Kobani, which had been strongly defended by Kurdish troops. The victory goes against hopeful western analysis Isis had overextended itself, while alienating much of the Muslim population through the murder of Henning.
Victory causes fresh waves of Kurdish refugees arriving in Turkey.
19/40 2014 - November
American hostage, who embarced values of Islam, Peter Kassig and 14 Syrian soldiers are shown meeting the same fate as other captives. But intelligence agencies will be poring over the apparently significant discrepancies between this and previous films.
Seramedig.org.uk
20/40 2015 - February
Isis has released a video revealing the murder by burning to death of a Jordanian pilot held by the group since the end of December 2014.
Reuters
21/40 2015 - February
Isis militants have released videos which appear to show the beheading of Japanese hostages Haruna Yukawa and Kenji Goto.
22/40 2015 - February
American aid worker, Kayla Mueller was the last American hostage known to be held by Isis. She died, according to her captors, in an airstrike by the Jordanian air force on the city of Raqqa in Syria, though US authorities disputed this.
AP
23/40 2015 - February
Isis militants have posted a gruesome video online in which they force 21 Egyptian Coptic Christian hostages to kneel on a beach in Libya before beheading them. Egypt vowed to avenge the beheading and launched air strikes on Isis positions.
AP
24/40 2015 - February
The British Isis militant suspected of appearing in videos showing the beheading of Western hostages has been named in reports as Mohammed Emwazi from London.
Rex Features
25/40 2015 - March
Isis triple suicide attack has killed more than 100 worshippers and hundreds of others were injured after the group members targeted two mosques in the Yemeni capital of Sanaa.
AP
26/40 2015 - April
Iraqi forces have claimed victory over Isis in battle for Tikrit and raised the flag in the city.
EPA/STR
27/40 2015 - April
Isis has claimed responsibility for a suicide bomb attack in Afghanistan that killed at least 35 people queuing to collect their wages and injured 100 more.
EPA
28/40 2015 - April
Isis’ media arm released a 29-minute video purporting to show militants executing Ethiopian Christians captives. The footage bore the extremist group’s al-Furqan media logo and showed the destruction of churches and desecration of religious symbols. A masked fighter made a statement threatening Christians who did not convert to Islam or pay a special tax.
29/40 2015 - May
Abu Bakr al-Baghdadi, the leader of Isis has been "incapacitated" by a spinal injuries sustained in a US air strike in Iraq. He is being treated in a hideout by two doctors from Isis’ stronghold of Mosul who are said to be "strong ideological supporters of the group".
30/40 2015 - May
Isis has also claimed responsibility for killing 300 of Yazidi captives, including women, children and elderly people in Iraq
AP
31/40 2015 - May
Isis attack on Prophet Mohamed cartoon contest in Texas was its first action on US soil. Two gunmen were shot and killed after launching the attack at the exhibition. Elton Simpson and Nadir Soofi have been named as the attackers at the Curtis Culwell Centre arena in Garland.
32/40 2015 - May
Isis’s deputy leader, Abu Alaa Afri, a former physics teacher who was thought to have taken charge of the deadly terrorist group, has been killed in a US-led coalition airstrike.
33/40 2015 - May
US special forces have killed a senior Isis leader named as Abu Sayyaf in an operation aiming to capture him and his wife in Syria.
Getty Images
34/40 2015 - May
Iran-backed militias are sent to Ramadi by the Iraqi government to fight Isis militants who completed their capture of the city. Government soldiers and civilians were reportedly massacred by extremists as they took control and the army fled. Charred bodies were left littering the city streets as troops clung on to trucks speeding away from the city.
Ramadi is the latest government stronghold to fall to the so-called Islamic State, despite air strikes by a US-led international coalition aiming to stop its advance in Iraq and Syria.
AFP
35/40 2015 - May
Isis rounded up civilians trapped in Palmyra and forced them to watch 20 people being executed in the historic city’s ancient amphitheatre. The Unesco World Heritage site was overrun by militants, threatening the future of 2,000 year-old monuments and ruins. Thousands of Palmyra’s residents fled but many are still living within the city walls, while the UN human rights office in Geneva said it had received reports of Syrian government forces preventing people from leaving until they retreated from the city.
Getty
36/40 2015 - May
A group of Isis-affiliated fighters have captured a key airport in central Libya. The militants took control of the al-Qardabiya airbase in Sirte after a local militia tasked with defending the facility withdrew from their positions. Affiliates of Isis, already control large parts of Sirte, the birthplace of former Libyan leader Muammar Gaddafi and a former stronghold of his supporters.
37/40 2015 - June
The US Air Force has destroyed an Isis stronghold after an extremist let slip their location on social media. According the Air Force Times, General Herbert "Hawk" Carlisle, commander of Air Combat Command, said that Airmen at Hulburt Field, Florida, used images shared by jihadists to track the location of their headquarters before destroying it in an airstrike.
Reuters
38/40 2015 - June
Kurdish forces captured a key military base in a significant victory in Raqqa as well as town of Tell Abyad. YPG fighters, backed by US-led airstrikes and other rebels, consolidated their gains, when they seized the key town on the Syria-Turkey border. They are now just 30 miles to the north of Raqqa and have cut off a major supply route deep inside Isis-held territory.
Ahmet Silk/Getty
39/40 2015 - June
Isis has released gruesome footage claiming to show the murder of more than a dozen men by drowning, decapitation and using a rocket-propelled grenade as it seeks to boost morale among its fanatical supporters.
40/40 2015 - June
Isis has begun carrying out its threat to destroy structures in the ancient Syrian city of Palmyra, blowing up at least two monuments at the Unesco-protected site as Syrian government troops made advances on the Islamist’s positions.
AFP
1/40 2000
Abu Musab al-Zarqawi (pictured here) forms an al-Qaeda splinter group in Iraq, al-Qa’eda in Iraq. Its brutality from the beginning alienates Iraqis and many al-Qaeda leaders.
2/40 2006
Al-Zarqawi is killed in a U.S. strike. Al-Zarqawi’s successor, Abu Ayyub al-Masri, announces the creation of the Islamic State in Iraq (ISI).
Reuters
3/40 2009
Still al-Qaeda-linked ISI claims responsibility for suicide bombings that killed 155 in Baghdad, as well as attacks in August and October killing 240, as President Obama announces troop withdrawal from Iraq in March.
Getty Images
4/40 2010
Abu Bakr al-Baghdadi becomes head of ISI, at lowest ebb of Islamist militancy in Iraq, which sees last U.S. combat brigade depart.
5/40 2012
In Syria, protests (pictured here starting in Daree) have morphed into what president Assad labelled a “real war” with emergence of a coalition of forces opposed to Assad’s regime. Syria group Jabhat al-Nusra are among rebel groups who refuse to join, denouncing it as a “conspiracy”.
Bombings targeting Shia areas, killing more than 500 people, spark fears of new sectarian conflict. Sunni Muslims stage protests across country against what they see as increasingly marginalisation by Shia-led government.
AP
6/40 2013
Al-Baghdadi renames ISI as the Islamic State in Iraq and Syria, or Isis, as the group absorbs Syrian al-Nusra, gaining a foothold in Syria.
In response, al-Qaeda chief Ayman al-Zawahiri (Bin Laden’s successor) concerned about Isis’ expansion orders that Isis be dissolved and ISI operations should be confined to Iraq. This order is rejected by al-Baghdadi.
AFP
7/40 2014 - January
Isis fighters capture the Iraqi cities of Fallujah and Ramadi, giving them base to launch slew of attacks further south.
AP
8/40 2014 - June
Isis declares itself the Caliphate, calling itself Islamic State (IS). The group captures Mosul, Iraq’s second largest city; Tal Afar, just 93 miles from Syrian border; and the central Iraqi city of Tikrit. These advances sent shockwaves around the world.
9/40 2014 - June
Around the same time Isis releases a video calling for western Muslims to join the Caliphate and fight, prompting new evaluations of extremists groups social media understanding.
10/40 2014 - June
Isis take Baiji oil fields in Iraq - giving them access to huge amounts of possible revenue.
EPA
11/40 2014 - August
James Foley is executed by the group as concerns grow for second American prisoner, fellow reporter Steven Sotloff.
AP
12/40 2014 - August
Obama authorises U.S. airstrikes in Iraq, helping to stall Isis’ along with action by Kurdish forces following the deaths of hundreds of Yazidi people on Mount Sinjar.
13/40 2014 - September
Isis release video showing Steven Sotloff’s murder prompting Western speculation his executioner is same man who killed Mr Foley.
EPA
14/40 2014 - September
Obama tells us that America “will hunt down terrorists who threaten our country”
EPA
15/40 2014 - September
Isis release a video appearing to show David Haines, who was captured by militants in Syria in 2013, wearing an orange jumpsuit and kneeling in the desert while he reads a pre-prepared script. It later shows what appears to be the aid worker's body.
Rex
16/40 2014 - September
Peshmerga fighters scrabble to hold positions in the Diyala province (a gateway to Baghdad) as Isis fighters continue to advance on Iraqi capital.
AFP
17/40 2014 - October
Aid worker Alan Henning is killed. Self-imposed media blackout refuses to show images of him in final moments, instead focuses upon humanitarian care.
AP
18/40 2014 - October
Isis raise their flag in Kobani, which had been strongly defended by Kurdish troops. The victory goes against hopeful western analysis Isis had overextended itself, while alienating much of the Muslim population through the murder of Henning.
Victory causes fresh waves of Kurdish refugees arriving in Turkey.
19/40 2014 - November
American hostage, who embarced values of Islam, Peter Kassig and 14 Syrian soldiers are shown meeting the same fate as other captives. But intelligence agencies will be poring over the apparently significant discrepancies between this and previous films.
Seramedig.org.uk
20/40 2015 - February
Isis has released a video revealing the murder by burning to death of a Jordanian pilot held by the group since the end of December 2014.
Reuters
21/40 2015 - February
Isis militants have released videos which appear to show the beheading of Japanese hostages Haruna Yukawa and Kenji Goto.
22/40 2015 - February
American aid worker, Kayla Mueller was the last American hostage known to be held by Isis. She died, according to her captors, in an airstrike by the Jordanian air force on the city of Raqqa in Syria, though US authorities disputed this.
AP
23/40 2015 - February
Isis militants have posted a gruesome video online in which they force 21 Egyptian Coptic Christian hostages to kneel on a beach in Libya before beheading them. Egypt vowed to avenge the beheading and launched air strikes on Isis positions.
AP
24/40 2015 - February
The British Isis militant suspected of appearing in videos showing the beheading of Western hostages has been named in reports as Mohammed Emwazi from London.
Rex Features
25/40 2015 - March
Isis triple suicide attack has killed more than 100 worshippers and hundreds of others were injured after the group members targeted two mosques in the Yemeni capital of Sanaa.
AP
26/40 2015 - April
Iraqi forces have claimed victory over Isis in battle for Tikrit and raised the flag in the city.
EPA/STR
27/40 2015 - April
Isis has claimed responsibility for a suicide bomb attack in Afghanistan that killed at least 35 people queuing to collect their wages and injured 100 more.
EPA
28/40 2015 - April
Isis’ media arm released a 29-minute video purporting to show militants executing Ethiopian Christians captives. The footage bore the extremist group’s al-Furqan media logo and showed the destruction of churches and desecration of religious symbols. A masked fighter made a statement threatening Christians who did not convert to Islam or pay a special tax.
29/40 2015 - May
Abu Bakr al-Baghdadi, the leader of Isis has been "incapacitated" by a spinal injuries sustained in a US air strike in Iraq. He is being treated in a hideout by two doctors from Isis’ stronghold of Mosul who are said to be "strong ideological supporters of the group".
30/40 2015 - May
Isis has also claimed responsibility for killing 300 of Yazidi captives, including women, children and elderly people in Iraq
AP
31/40 2015 - May
Isis attack on Prophet Mohamed cartoon contest in Texas was its first action on US soil. Two gunmen were shot and killed after launching the attack at the exhibition. Elton Simpson and Nadir Soofi have been named as the attackers at the Curtis Culwell Centre arena in Garland.
32/40 2015 - May
Isis’s deputy leader, Abu Alaa Afri, a former physics teacher who was thought to have taken charge of the deadly terrorist group, has been killed in a US-led coalition airstrike.
33/40 2015 - May
US special forces have killed a senior Isis leader named as Abu Sayyaf in an operation aiming to capture him and his wife in Syria.
Getty Images
34/40 2015 - May
Iran-backed militias are sent to Ramadi by the Iraqi government to fight Isis militants who completed their capture of the city. Government soldiers and civilians were reportedly massacred by extremists as they took control and the army fled. Charred bodies were left littering the city streets as troops clung on to trucks speeding away from the city.
Ramadi is the latest government stronghold to fall to the so-called Islamic State, despite air strikes by a US-led international coalition aiming to stop its advance in Iraq and Syria.
AFP
35/40 2015 - May
Isis rounded up civilians trapped in Palmyra and forced them to watch 20 people being executed in the historic city’s ancient amphitheatre. The Unesco World Heritage site was overrun by militants, threatening the future of 2,000 year-old monuments and ruins. Thousands of Palmyra’s residents fled but many are still living within the city walls, while the UN human rights office in Geneva said it had received reports of Syrian government forces preventing people from leaving until they retreated from the city.
Getty
36/40 2015 - May
A group of Isis-affiliated fighters have captured a key airport in central Libya. The militants took control of the al-Qardabiya airbase in Sirte after a local militia tasked with defending the facility withdrew from their positions. Affiliates of Isis, already control large parts of Sirte, the birthplace of former Libyan leader Muammar Gaddafi and a former stronghold of his supporters.
37/40 2015 - June
The US Air Force has destroyed an Isis stronghold after an extremist let slip their location on social media. According the Air Force Times, General Herbert "Hawk" Carlisle, commander of Air Combat Command, said that Airmen at Hulburt Field, Florida, used images shared by jihadists to track the location of their headquarters before destroying it in an airstrike.
Reuters
38/40 2015 - June
Kurdish forces captured a key military base in a significant victory in Raqqa as well as town of Tell Abyad. YPG fighters, backed by US-led airstrikes and other rebels, consolidated their gains, when they seized the key town on the Syria-Turkey border. They are now just 30 miles to the north of Raqqa and have cut off a major supply route deep inside Isis-held territory.
Ahmet Silk/Getty
39/40 2015 - June
Isis has released gruesome footage claiming to show the murder of more than a dozen men by drowning, decapitation and using a rocket-propelled grenade as it seeks to boost morale among its fanatical supporters.
40/40 2015 - June
Isis has begun carrying out its threat to destroy structures in the ancient Syrian city of Palmyra, blowing up at least two monuments at the Unesco-protected site as Syrian government troops made advances on the Islamist’s positions.
AFP
With the backing of Russian air strikes, forces loyal to President Assad were able to drive back militants from several villages near the airport last January but have so far failed to dislodge them.
A fragile “cessation of hostilities” truce has held in Syria for over a month as the various parties to the conflict try to negotiate an end to the country’s five-year long civil war.
But the truce excludes Isis, the al-Qaeda-affiliate Jabhat al-Nusra and other designated terrorist groups, allowing offensives by regime forces, Russia and the US-led coalition to continue.
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