Britain has been a frequent target for major bomb attacks even before the London blasts.
The latest London attacks came nine years after Docklands was hit
February 1974: Twelve killed and 14 hurt when a bomb planted by the IRA blows up on a coach carrying soldiers and families from Manchester to their base in Catterick, North Yorkshire.
October-November 1974: The IRA steps up its campaign, killing 28 people and injuring more than 200 in attacks on British pubs in Birmingham, Guildford and Woolwich, south-east London.
March 1979: Shadow Northern Ireland secretary Airey Neave, a close friend of Conservative leader Margaret Thatcher, is murdered when a car bomb planted by the Irish National Liberation Army explodes as he drives up the exit ramp of the underground car park at the House of Commons.
July 1982: Two IRA bomb attacks on soldiers in London's Hyde Park and Regents Park kill 11 people and wound 50.
December 1983: Six people - including three police officers - are killed and 90 are injured when an IRA bomb explodes at London's Harrods department store.
October 1984: Prime Minister Margaret Thatcher's cabinet survive an IRA bomb attack on the Grand Hotel in Brighton, where Tory party members are staying during their annual conference. Five people die and 34 are wounded.
December 1988: A Pan Am Boeing 747 crashes on the town of Lockerbie, Scotland, killing all 259 on board after a bomb explodes. Eleven people in Lockerbie are also killed.
The Tory Cabinet were at the Grand Hotel when the bomb went off
September 1989: A bomb at the Royal Marines School of Music in Deal, Kent, kills 11 bandsmen and wounds 22 others.
July 1990: Tory MP Ian Gow, who had opposed an Anglo-Irish agreement on Northern Ireland, was killed by an IRA bomb which exploded at his Sussex home.
April 1992: A huge car bomb outside the Baltic Exchange in London's financial district kills three people and wounds 91.
March 1993: Two children die when bombs explode in two litter bins in Warrington, Cheshire. Jonathan Ball, three, and Tim Parry, 12, are killed as they walk through the shopping centre.
April 1993: London's financial district is again targeted as an IRA lorry bomb devastates the Bishopsgate area, killing one and wounding 44.
February 1996: An IRA ceasefire comes to a bloody end when a large bomb explodes in London's Docklands area, killing two people and causing massive damage.