The officers arrested a 56-year-old man from east London in the area at approximately 5.40am this morning, Monday, 17 July.
They arrested a 28-year-old Canadian national at Heathrow Airport at approximately 12.35hrs, after he arrived on a flight from Canada.
Both were arrested on suspicion of membership of a proscribed organisation, contrary to section 11 of the Terrorism Act 2000.
The men are currently being held under section 41 of the Terrorism Act 2000, at a west London police station.
Police searches of three addresses in east London are ongoing.
