Police have arrested a man at Heathrow Airport on suspicion of terrorism offences.
The man aged 29 was arrested as he was about to board a flight to Saudi Arabia.
The man is being interviews by officers from the Scotland Yard Counter Terrorism Command on suspicion of possessing information of a kind likely to be useful to a person committing or preparing an act of terrorism.
A crime scene is now in place at a West London address which is being searched by officers. Police have already seized a number of electronic devices for analysis.