Three male teenagers were detained in Turkey and quickly sent back to the United Kingdom after they were stopped from traveling to Syria to join the ISIS.

Two boys aged 17 from northwest London and a 19-year-old man were held in Istanbul after British authorities alerted Turkish officials, who were able to intercept them before crossing the Turkey-Syria border.

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Upon their return to the UK Saturday night, the Metropolitan Police's Counter Terrorism Command (CTC) arrested the male trio on suspicion there were preparing terrorist acts and are about to join the ISIS. None of them have yet been charged.

The teens were reported missing last Friday and further reports revealed they were traveling with a third man.

"Officers alerted the Turkish authorities who were able to intercept all three males, preventing travel to Syria," a UK police spokesman said.

Turkish authorities meanwhile said the teenagers flew to Istanbul from Barcelona, Spain. They were stopped at Istanbul's Sabiha Gokcen airport.

"This is a good and a clear example of how the security cooperation between Western intelligence agencies and Turkey should work," a Turkish official said.

Turkey and the UK had been throwing blames at each other following the disappearance of three London schoolgirls who were also believed to have traveled to Syria to join the Islamic State. Turkey's deputy Prime Minister said Turkish authorities were not given enough information and warning about the missing girls.

British teens Shamima Begum, Amira Abase, both 15, and Kadiza Sultana, 16, left London and took flights to Istanbul last month. CCTV footage of the girls were published, showing them at an Istanbul bus station as they prepare to board a bus to the Turkish border.

Just days ago, a video has also been released purportedly showing the schoolgirls at the Turkish border, preparing to cross to Syria. They were seen accompanied by a man.

The girls are now believed to have reached ISIS's de facto capital of Raqqa, in Syria.

The families of the missing schoolgirls have repeatedly called for the safe return of their daughters. 

British legislator Keith Vaz, Chairman of the Home Affairs Select Committee, said the case of the male teens is an indication Britons being lured to come to the conflict zone in Syria to join the ISIS "is on a much larger scale" than it had been thought. 

Tagsbritish teens, ISIS, Turkey, UK