A man aged 19 from Coventry has been arrested at Heathrow Airport on suspicion of “preparing for acts of terrorism”, police said.
The teenager was detained by officers from the West Midlands Counter Terrorism Unit at around 3pm on Thursday as he disembarked from a flight from Jordan.
Police said that he is currently in custody in the West Midlands area.
West Midlands Police said that the arrest had been planned in advance and came about as a result of intelligence received.
The force said there was no risk posed to the flight by the suspect.