Within one minute on July 7, the first full day of the 31st G8 summit in Scotland, a series of three bomb explosions struck London's public transportation system during the morning rush hour. An hour later, a fourth bomb exploded on a city bus.

The incidents, which killed at least 54 people and left 700 injured, are the deadliest bombings in London since the Blitz during World War II, and the deadliest terrorist attack since the 1988 bombing of Pan Am Flight 103 over Lockerbie, Scotland. In addition, the city's transport and telecommunication infrastructure was severely disrupted for nearly a day.

Investigators have identified four men, three from West Yorkshire, who are thought to have carried out the attacks. Another man is reported to have been arrested in connection with at least one of the suspects. The bombings are believed to have been planned by Islamic terrorist organizations based in the United Kingdom. The attacks occurred two days after the trial of radical cleric Abu Hamza began in London.

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