Five men pleaded innocent Friday to charges of conspiring to murder passengers with bombs on London's transit system on July 21.

They are accused of plotting to bomb three subway trains and a bus two weeks after four other suspected bombers killed 52 people and themselves aboard three London Underground trains and a double-decker bus.

Muktar Said Ibrahim, 27, Ramzi Mohammed, 23, Yassin Omar, 24, Manfo Asiedu, 32, and Hussein Osman, 27, all of London, appeared via video link at the Central Criminal Court.

All five also pleaded innocent to charges of possession of explosives and conspiracy to cause explosions likely to endanger life and property.

Ibrahim, Mohammed, Omar and Osman pleaded not guilty to attempting to murder passengers on three trains and a bus.

A trial date was set for early October.

Indictment of Adel Yahya, 23, from London, on a charge of conspiracy to cause explosions likely to endanger life, was postponed until June.

Eleven other people have been charged with assisting the would-be bombers or failing to disclose information.