Story highlights Three teens were released on bail in London, where they face terror charges

Three males -- two of them 17, one of them 19 -- detained by Turkish authorities, police say

(CNN) Three teenagers from northwest London were released on bail Sunday after their alleged plans to travel to Syria led to their arrest.

Two 17-year-olds boys and a 19-year-old man were arrested "on suspicion of preparation of terrorist acts," the Metropolitan Police said.

The investigation started on Friday, after police learned the two 17-year-olds were missing and were believed to be traveling to Syria. They were traveling with a 19-year-old, police said.

British authorities shared intelligence regarding the 17-year-olds with Turkish officials on Friday, and that night, the individuals landed in Istanbul on a flight from Barcelona, Spain, a Turkish official told CNN.

The teens were stopped, along with another person who had been regarded as suspicious by Turkish intelligence working at the airport's risk analysis center, which monitors risky flights and runs checks on suspicious passengers trying to enter Turkey.

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