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.