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A British Royal Marine was interviewed by police on suspicion he was planning to travel to fight with Kurdish forces against Isis militants during his time on leave.
The Royal Marine was questioned two weeks ago as he prepared to fly from California to Turkey, the Daily Mail has reported. He was released without condition and was not arrested or held at any time.
The man was stopped while trying to board a flight from Los Angeles to Istanbul on a one way ticket.
He was reportedly suspected of planning to join Kurdish forces battling the advances of Isis in Syria and Iraq.
The man, believed to be 22-years-old, is understood to have been due to go on leave.
US officials said the man was believed to have been in contact with a Kurdish group that had links in Turkey and the city of Irbil, where the headquarters of Peshmerga units fighting Isis are based.
Kurdish fighters are leading attempts on the ground to combat the threat posed by Isis (also known as Islamic State), who have seized large swathes of Syria and Iraq, with the help of US led-coalition air strikes.
Show all 22 1 /22Isis fighters in Kobani (2014): Civilians flee as militants enter Syria-Turkey border Isis fighters in Kobani (2014): Civilians flee as militants enter Syria-Turkey border Syria-Turkey border Mourners gathered to bury three Kurdish fighters from Kobani
Isis fighters in Kobani (2014): Civilians flee as militants enter Syria-Turkey border Syria-Turkey border An explosion rocks the Syrian city of Kobani during a reported suicide car bomb attack by Isis
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Isis fighters in Kobani (2014): Civilians flee as militants enter Syria-Turkey border Syria-Turkey border The US and Turkey have stepped up support for Kurdish fighters defending Kobani against Isis but it is still feared the town may fall; above, observers watch the fighting from a nearby village
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Isis fighters in Kobani (2014): Civilians flee as militants enter Syria-Turkey border Syria-Turkey border People are silhouetted on the top of a hill close to the border line between Turkey and Syria near Mursitpinar bordergate as they watch the U.S led airstrikes over ther Syrian town of Kobani
Isis fighters in Kobani (2014): Civilians flee as militants enter Syria-Turkey border Syria-Turkey border Syrian Kurd Kiymet Ergun (56) gestures, in Mursitpinar on the outskirts of Suruc, at the Turkey-Syria border, as thick smoke rises following an airstrike by the US-led coalition in Kobani, as fighting continued between Syrian Kurds and the militants of Isis group
Isis fighters in Kobani (2014): Civilians flee as militants enter Syria-Turkey border Syria-Turkey border Kurdish Rabia Ali (R) accompanied by her son Ali Mehmud (L) mourn at the grave of her son Seydo Mehmud 'Curo', a Kurdish fighter, who was killed in the fighting with the militants of the Islamic State group in Kobani, and was buried at a cemetery in Suruc, on the Turkey-Syria border
Isis fighters in Kobani (2014): Civilians flee as militants enter Syria-Turkey border Syria-Turkey border Mourners gather for the funeral of two Syrian Kurdish fighters killed in fighting with militants of the Isis group in Kobani at a cemetery in Suruc
Isis fighters in Kobani (2014): Civilians flee as militants enter Syria-Turkey border Syria-Turkey border Kurdish refugees fleeing Kobani enter Turkey at Suruc
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Isis fighters in Kobani (2014): Civilians flee as militants enter Syria-Turkey border Syria-Turkey border Smoke from air strikes against Isis in Kobani can be seen from across the border in Mursitpinar, Turkey
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Isis fighters in Kobani (2014): Civilians flee as militants enter Syria-Turkey border Syria-Turkey border Newly arrived Kurdish refugees after crossing into Turkey from the Syrian border town of Kobani
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Isis fighters in Kobani (2014): Civilians flee as militants enter Syria-Turkey border Syria-Turkey border Kurdish refugees cross the border near Kobani
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Isis fighters in Kobani (2014): Civilians flee as militants enter Syria-Turkey border Syria-Turkey border Smoke rises from the city centre of Kobani
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Isis fighters in Kobani (2014): Civilians flee as militants enter Syria-Turkey border Syria-Turkey border Isis militants stand next to an Isis flag atop a hill in the Syrian town of Ain al-Arab, known as Kobani by the Kurds, as seen from the Turkish-Syrian border, with Turkish troops in foreground, in the southeastern town of Suruc, Sanliurfa province
Isis fighters in Kobani (2014): Civilians flee as militants enter Syria-Turkey border Syria-Turkey border A flag of Isis group is seen atop of a building at the eastern side of the town of Kobani, Syria, where fighting had been intensified between Syrian Kurds and the militants of Isis group
Isis fighters in Kobani (2014): Civilians flee as militants enter Syria-Turkey border Syria-Turkey border Militants with the Isis group are seen after placing their group's flag on a hilltop at the eastern side of the town of Kobani
Isis fighters in Kobani (2014): Civilians flee as militants enter Syria-Turkey border Syria-Turkey border Smoke rises after an apparent airstrike by allied forces against Isis targets in the west of Kobani where Kurdish fighters try to defend the town, near Suruc district, Sanliurfa, Turkey
Isis fighters in Kobani (2014): Civilians flee as militants enter Syria-Turkey border Syria-Turkey border Newly arrived Syrian Kurdish refugees stand at the back of a truck after crossing into Turkey from the Syrian border town Kobani, near the southeastern Turkish town of Suruc in Sanliurfa province
Isis fighters in Kobani (2014): Civilians flee as militants enter Syria-Turkey border Syria-Turkey border Turkish forces fire tear gas to disperse Kurds on the outskirts of Suruc, at the Turkey-Syria border, as fighting intensified between Syrian Kurds and the militants of Isis in Kobani
Isis fighters in Kobani (2014): Civilians flee as militants enter Syria-Turkey border Syria-Turkey border Kurdish men shout towards Turkish army soldiers, who try to evacuate people from the village of Mursitpinar, on the other side of the Syrian town of Ain al-Arab, known as Kobani by the Kurds, by the Turkish-Syrian border in Sanliurfa province
Isis fighters in Kobani (2014): Civilians flee as militants enter Syria-Turkey border Syria-Turkey border Turkish Kurds walk as tanks in the background hold their positions on a hilltop in the outskirts of Suruc, at the Turkey-Syria border, overlooking Kobani in Syria where fighting had ben intensified between Syrian Kurds and the militants of Isis
Isis fighters in Kobani (2014): Civilians flee as militants enter Syria-Turkey border Syria-Turkey border Turkish Gendarmerie use tear gas to disperse Kurdish protesters during a demonstration against the Isis, at the Syria-Turkey border near Sanliurfa
Isis fighters in Kobani (2014): Civilians flee as militants enter Syria-Turkey border Syria-Turkey border Smoke rises from the Syrian town of Ain al-Arab, on the Turkish-Syrian border in the southeastern town of Suruc, Sanliurfa province
The officials said the Marine's one-way ticket “rang alarm bells”, according to the Mail , and his luggage and phone was reportedly examined.
The Marine is serving with 45 Commando unit based in Arbroath, Scotland but had been in the Californian desert training with US marines.
The man was returned to 45 Commando and quizzed by Police Scotland after arriving in the UK.
A Navy spokesman said: “We are aware of an incident involving a Royal Marine who has recently been interviewed by Police Scotland.
“The matter is being investigated by the Royal Marines. It would be inappropriate to comment further.”
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