Everything seems normal as the passengers stream out of a routine flight from a Middle Eastern country after landing at a major Turkish international airport.

Everything seems normal as the passengers stream out of a routine flight from a Middle Eastern country after landing at a major Turkish international airport.

But as they cross the air bridge from the plane into the airport, two plainclothes Turkish police -- on the lookout for 'jihadists' on their way to Syria -- scrutinize their appearance and behavior.

They check the passengers' passports and detain two men who arouse suspicions after saying they are travelling on to the city of Adana, in southern Turkey.

The country has long been accused of facilitating the transit of 'jihadists' across its territory to Syria. Thousands have taken commercial flights to Turkish airports before heading overland to Syria to fight alongside ISIL militants.