Armed officers joined those from the counter terrorism command when the arrests were made at about 4am.
Police say the operation was not linked to the Olympics.
A 38-year-old woman was also arrested for alleged fraud offences and two other men were held over alleged immigration offences.
More top news
Tory Chief Whip Michael Gove has taken time out from his schedule to claim second place in Westminster's Dog of the Year competition.
An airline safety video features orcs in oxygen masks, elves for flight attendants and epic battlefield scenes.
TV presenters Richard Madeley and Judy Finnigan say they have made a formal complaint after their daughter received rape threats.