The IRA began a bombing campaign in Britain in 1973 when they exploded a car bomb outside the Old Bailey on 8 March of that year. According to the leader of the Balcombe Street unit, the first bombing they carried out was the Guildford pub bombings on 5 October 1974, which killed five people and injured over 60 others. In February 1975, the Provisional Irish Republican Army agreed to a truce. Before the truce, the IRA Active service unit (ASU), later dubbed the Balcombe Street Gang (because of the December 1975 Balcombe Street siege), had been bombing targets in England since autumn 1974, particularly in London and Surrey. In total the unit carried out around 40 bomb and gun attacks on mainland Britain between October 1974 - December 1975.