Beginning on this day in 2002 a 21-year old college student planted a series of pipe bombs in rural mailboxes across five midwestern US states.
On this day in 1993 two bombs planted in litter bins on a busy shopping street in Warrington detonated within minutes of each other, killing two children.
On this day in 1991 the IRA launched mortars at the offices of UK Prime Minister John Major in 10 Downing Street
The May 1974 car bombs in Dublin and Monaghan demonstrated that the IRA was not the only violent actor: the UVF was equally violent.
The Clerkenwell explosion, also known as the Clerkenwell Outrage, was a bombing in London on 13 December 1867. The Irish Republican Brotherhood exploded a bomb to try to free one of their members being held at Clerkenwell Prison.
On this day in 1974, bombs went off in two pubs popular with British army personnel in Guildford that was close to several military barracks.