A 29-year-old man has been arrested at Heathrow Airport on suspicion of terrorism as he was about to board a flight to Saudi Arabia.
The suspect was held by officers from Scotland Yard's 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 home in west London is now being searched and the force said several electronic devices have been seized for analysis.
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The man has been taken to a police station in the capital where he is being questioned.