The SAS is prepared to conduct "kill or capture" missions to stop British jihadis escaping jail cells in Syria, reports have claimed.

As tensions mount amid the Turkish invasion on Kurdish militia in northern Syria, 785 foreigners affliated with ISIS are said to have escaped the Ain Issa camp near Raqqa.

The Special Air Service are now reportedly on standby to target prisons across the north of the country holding members of the Islamic State in Iraq and Syria (ISIS).

A source told The Daily Star : "British extremists are banged up in jails in northern Syria. The remnants of the Islamic State army is waiting to escape and either return to the fight or return to their home countries.

“The British special forces have been placed on standby.

“The SAS will either try to capture or kill British, European or foreign jihadis who pose a threat.”

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A statement shared by the Kurdish-led administration revealed that "mercenaries" attacked Ain Issa with " Daesh elements" before attacking guards and opening the gate, the Daily Mail reported .

It is believed UK ISIS "matchmaker" Tooba Gondal, 25, from Walthamstow, was at the camp with her two children after she was caught trying to reach Turkey after the fall of Baghuz.

British forces are said to be ready to deploy in teams of eight in helicopter or vehicles in the next few days if the threat of mass prison breakout is imminent.

The decision to prepare troops comes after intelligence officers warned the Government of a "huge number" of dangerous British ISIS that could potentially be freed in the coming weeks.

The state of crisis in the region has been escalated this week after Turkey invaded northern Syria, following a decision by Donald Trump , the US President, to withdraw all US forces from the region.

The US leader's decision sparked fears that a new war could destabilise the area and lead to conflict involving Turkey, ISIS and the Kurds.

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British intelligence officers believe ISIS radicals could escape if their Kurdish guards abandon prisons in the wake of an attack by the Turkish armed forces.

The news of the planned response to heightened tensions in the region came after five ISIS terrorists escaped Kurdish captivity on Friday after a shell landed in the courtyard of the jail.

The prison, Navkur, is located in a Kurdish area, west of Qamishli city and houses some ISIS "foreign fighters".

The chaos has raised fears that the Turkish invasion on Kurdish-held northeastern Syria may undermine the security of over two dozen facilities where 10,000 ISIS militants are held.

The death till among Kurdish-led fighters is 104, with 45 of the Syrian Democratic Forces killed.

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More than 130,000 people have been displaced from rural areas around the northeast Syria border towns of Tel Abyad and Ras al Ain as a result of the conflict.

In a statement, the United Nations Office for the Coordination of Humanitarian Affairs said OCHA and other relief agencies estimated up to 400,000 civilians in the Syrian conflict zone may require aid and protection in the coming period.

Turkey is facing threats of possible sanctions from the US unless it calls off the incursion, while the Arab League has denounced the operation.

NATA allies Germany and France added that they were halting weapons exports to Turkey.

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(Image: AFP/Getty Images)

In the latest criticism, British Prime Minister Boris Johnson expressed 'grave concern' about the offensive to Turkish President Tayyip Erdogan, saying it may worsen the humanitarian situation and undermine progress against Islamic State.

The SAS is the British Army's most renowned special forces unit whose motto is "Who Dares Wins".

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They became "celebrity" figures after several black-clad figures appeared on the balconies of the Iranian Embassy in London in 1980.

The Ministry of Defence told the Mirror Online it does not comment on the special forces.