article_snippet: 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.
article_snippet: 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.
article_snippet: And of course Turkish intelligence is always on the lookout as well," a Turkish official said.
article_snippet: Turkey on Thursday arrested a person who worked for an undisclosed nation's intelligence service on suspicion of helping the girls, according to Turkey's foreign minister.
article_snippet: On Friday, a Turkish television network aired a video purportedly showing the girls preparing to cross the Turkish border into Syria.