The Provisional IRA had first attacked Great Britain in March 1973 with car bombs in London which injured over 200 people. Beginning in October 1974 the IRA launched a sustained bombing campaign in England which lasted until December 1975 when the IRA unit responsible for the campaign was caught after a 6-day siege. Thereafter the IRA launched more sporadic but more spectacular attacks on Britain which generated worldwide publicity like the Hyde Park and Regent's Park bombings (which killed 11 British soldiers, injured dozens of soldiers and civilians and killed 7 horses) and an attempt to kill the then British Prime Minister Margaret Thatcher with the 1984 Brighton bombing.