56 people , including the four suicide bombers , were killed by the attacks and about 700 were injured , of whom about 100 were hospitalised for at least one night . The incident was the deadliest single act of terrorism in the United Kingdom since the 1988 bombing of Pan Am Flight 103 , which crashed on Lockerbie and killed 270 people , and the deadliest bombing in London since the Second World War
Pan Am Flight 103
Pan Am Flight 103
7 July 2005 London bombings