Detectives from the Met Police Counter Terrorism Command have arrested a man on suspicion of preparation of terrorist acts contrary to section 5 of the Terrorism Act 2006.
The man, a 29-year-old Finnish national, was stopped by police officers under schedule 7 of the Terrorism Act 2000 at approximately 23:05hrs on Sunday, 10 June, as he attempted to board a connecting flight at Heathrow Airport.
The arrest does not relate to offences at the airport.
He was subsequently arrested on suspicion of preparation of terrorist acts at around 05:00hrs on 11 June, and held in custody under the Terrorism Act at a south London police station.
Counter terrorism detectives were granted a warrant of further detention yesterday, Tuesday, 12 June. This will expire at approximately 23:00hrs on Sunday, 17 June.