On Thursday 7 July 2005 , a series of four bomb explosions struck London 's public transport system during the morning rush-hour . All four incidents were suicide bombings . Fifty-six people were killed and 700 people were injured . The incident was the deadliest single act of terrorism in the United Kingdom since the 1988 bombing of Pan Am Flight 103 over Lockerbie , Scotland which killed 270 people and replaced the 1998 Omagh bombing ( 29 dead ) as the second-most deadly terrorist attack on British soil . It was also the deadliest bombing in London since World War II
Pan Am Flight 103
Pan Am Flight 103
Premiership of Tony Blair