Anti-terrorist police arrested a 27-year-old man Tuesday for allegedly helping the suspected attackers after the failed bombings on London's transit network this summer, authorities said.

Police raided two homes and a business in western London after the man was detained at 11:40 a.m., a spokesman for London's Metropolitan police department said.

"He has been taken to a central London police station where he will be interviewed," the police spokesman said, speaking on condition of anonymity in line with department policy.

The man is the 44th person to be arrested in the July 21 attacks, which took place two weeks after homicide bombers targeted three subway trains and a bus, killing 52 people and the four attackers.

The suspect allegedly gave assistance to the attackers after the bombing, other officials said without elaborating. Sixteen people have been charged in the failed attacks.

Five men are accused of conspiracy to murder and are due to stand trial at London's Central Criminal Court in September.

A sixth man is accused of conspiracy to cause explosions while 10 others are charged with failing to disclose information. No date has been set for their trials.