On this day in 2005, terrorists attempt to attack the London transit system by planting bombs on three subways and on one bus; none of the bombs detonate completely. The attempted attack came exactly two weeks after terrorists killed 56 people, including themselves, and wounded 700 others in the largest attack on Great Britain since World War II. The previous attack also targeted three subways and one bus.

The failed bombs were found at the London Underground’s Oval, Warren Street and Shepherd’s Bush stations and on a bus in Hackney. Two days later, a fifth bomb, apparently abandoned, was found in some bushes near a park in Little Wormwood Scrubs.

The five men believed to be the bombers–Ibrahim Muktar Said, Yassin Hassan Omar, Hussain Osman, Ramzi Mohamed and Manfo Kwaku Asiedu–left behind substantial forensic evidence and were arrested by the end of July. All are charged with conspiracy to commit murder, among other charges. Their trial is set to begin in September 2006.

An estimated 3 million people ride the London Underground every day, with another 6.5 million using the city’s bus system.