British counter-terrorist police said Thursday they had arrested three suspects over the July 7, 2005, London transit bombings, which killed 52 commuters and four bombers.
No one has ever been charged in connection with the bombings, the deadliest attack on London since World War II.
The Metropolitan Police said two men, aged 23 and 30, were arrested at Manchester Airport in northwest England as they prepared to board a flight to Pakistan. The third man, 26, was arrested at a house in Leeds, northern England, where police were searching five homes.
All were arrested on suspicion of committing, preparing or instigating acts of terrorism. The force said the suspects were being taken to a central London police station for questioning.