A man has been arrested by British counter-terror police at Stansted Airport on suspicion he planned on travelling to Syria.
The 37-year-old man was stopped before boarding a flight to Turkey on Tuesday night.
He was arrested on suspicion of preparing for acts of terrorism, although the arrest was not connected to the Manchester Arena attack, Scotland Yard said.
The man, who has not been identified, is being held at a south London police station while officers search two residential addresses in the north of the city.
On Monday 22 people were killed and dozens injured in a suicide bomb attack at the Manchester Arena.