ANKARA: Three British teenagers who were planning to join Islamic State militants in Syria were detained in the Turkish city of Istanbul, Turkish officials said on Sunday.

The three, who have not been named, were detained on Friday, Turkish sources told Reuters. They said arrangements were being made with British authorities to deport them this week.

Police in London said they had been made aware that two 17-year-old boys had gone missing and were thought to be traveling to Syria. Further inquiries revealed they had traveled with a 19-year-old male.

“Officers alerted the Turkish authorities who were able to intercept all three males, preventing travel to Syria. They remain in detention in Turkey. The families have been kept informed of developments,” the police statement said.

Three British schoolgirls entered Turkey last month and are thought to have joined Islamic State in Syria.