This Day In History: July 21

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On July 21, 2005, terrorists attempt to attack the London transit system by 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鈥檚 Oval, Warren Street and Shepherd鈥檚 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 four bombers, Muktar Said Ibrahim, 29, Yasin Hassan Omar, 26, Ramzi Mohammed, 25, and Hussain Osman, 28, were found guilty of conspiracy to murder and sentenced to life in prison. 

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