At least 86 people have been killed and more than 186 wounded in two suspected suicide bombings in the Turkish capital.
Hundreds of people were gathering for a peace rally outside Ankara’s main train station when the explosions hit the crowd.
Graphic images on social media showed bodies lying in the streets and the wounded sitting in shock, covered in blood.
Witnesses at the scene described survivors covering people’s bodies with flags and banners, including those of the pro-Kurdish opposition Peoples' Democratic Party (HDP), on roads filled with body parts and blood.
Philip Hammond, the Foreign Secretary, said the UK "stands with the Turkish people" as rescue work continued.
"Appalled by the barbaric attacks in Ankara," he wrote on Twitter. "My thoughts are with the loved ones of those killed and injured."
Turkey’s Interior Ministry said the explosions were a terror attack, although there was no immediate claim of responsibility, and the health minister put the toll at 86 dead and 186 wounded.
There is strong evidence to suggest two suicide bombers carried out the massacre, the Prime Minister said. Ahmet Davutoglu declared three days of national mourning after the attack, which was the deadliest of its kind on Turkish soil.
Thorbjorn Jagland, Secretary General of the Council of Europe, said: ”This is a ruthless and barbaric attack on peaceful demonstrators. Freedom of assembly and freedom of expression are fundamental pillars of democracy.”
Ankara explosions - in pictures
Ankara explosions - in pictures
1/15 Ankara attack
Family members of Korkmaz Tedik, a victim of bomb blastsin Ankara, mourn over his coffin during a funeral ceremony
2/15 Ankara attack
Women carry the coffin of Sarigul Tuylu who was killed in a blast in Ankara during a funeral in Istanbul
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Police use tear gas and water cannon to disperse people marching to protest the double suicide bombing in Ankara
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The father of Sarigul Tuylu, 35, a mother of two that was killed in bombing attacks in Ankara, Turkey, is carried away after he fainted during her funeral in Istanbul
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A man lowers the body of Sarigul Tuylu, 35, a mother of two that was killed in bombing attacks in Ankara, Turkey, during her funeral in Istanbul
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Mourners chant slogans as they escort a vehicle carrying the coffin of Sarigul Tuylu, 35, a mother of two that was killed in bombing attacks in Ankara, Turkey, during her funeral in Istanbul
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Victims lie on the street as the scene of the explosion is cordoned off following an explosion at the main train station in Turkey's capital Ankara, on October 10, 2015.
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An injured man holds another casualty after the blasts in Ankara
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An injured woman being helped following the explosion on Saturday morning.
10/15 Ankara attack
An injured person is comforted as she lies on a rally banner following an explosion at the main train station in Turkey's capital Ankara, on October 10, 2015.
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Bodies of victims are covered with flags and banners as police officers secure the area after an explosion in Ankara, Turkey, Saturday, Oct. 10, 2015.
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Blood covered flags are seen at the blast scene after an explosion during a peace march in Ankara, October 10, 2015 Turkey.
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An injured person is lifted away using a rally banner following an explosion at the main train station in Turkey's capital Ankara, on October 10, 2015.
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Victims at the blast scene after an explosion during a peace march in Ankara, October 10, 2015 in Ankara, Turkey
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Paramedics and police work outside Ankara Central Station after multiple explosions in Turkey, 10 October 2015.
The protest, organised by trade unions and supported by left-wing parties and pro-Kurdish groups, was being held to denounce the increased violence between Kurdish rebels and Turkish security forces.
Lami Ozgen, head of the Confederation of Public Sector Trade Unions, which organised the protest, said two bombs “exploded in very short intervals”.
“There was a massacre in the middle of Ankara,” he added.
“We're ready to come together and work sincerely to finish terror,” the leader of the main opposition party, Kemal Kilicdaroglu, told reporters.
Violence between Turkey and the Kurdistan Workers’ Party (PKK) militants has flared in recent months, with Turkey launching operations in response to what it said were rising attacks on security forces in the predominantly Kurdish south-east. Hundreds have since died.
The country has been on high alert since starting its “synchronised war on terror” in July, including air strikes against Isis in Syria and Kurdish fighters with the People’s Defence Force in northern Iraq.
It has also rounded up hundreds of suspected Kurdish and Islamist militants at home.
An HDP rally in the southeastern city of Diyarbakir was bombed on the eve of the last election in June and a suicide bombing blamed on Isis killed 33 mainly pro-Kurdish activists in the town of Suruc, near the Syrian border, in July.
The PKK called on its fighters and supporters to stop guerrilla activities in Turkey and only fight if they were directly attacked in the wake of Saturday’s bombing.
Firat news agency reported the head of the PKK as saying the decision was taken in response to calls from within and outside Turkey and that its fighters would avoid acts which could prevent a “fair and just election” being held on 1 November.
Additional reporting by Reuters and AP
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