This is a chronology of activities by the Provisional Irish Republican Army (IRA), in 1990 and 1991.
1990
January–February
2 January 1990: Ulster loyalist Harry Dickey, a member of the Ulster Defence Association (UDA) and Ulster Democratic Party, was killed by a Provisional IRA booby trap bomb attached to his car outside his home, Larkfield Manor, Sydenham, East Belfast. an IRA unit threw a blast bomb at a Royal Ulster Constabulary (RUC) base in Stewartstown, County Tyrone. 3 January 1990: an Ulster Defence Regiment (UDR) soldier was seriously injured in an IRA under-car booby trap bomb attack in Magherafelt, County Londonderry. two British soldiers were injured after a device exploded behind a garden wall in Ardoyne, North Belfast. 4 January 1990: a British soldier was slightly injured by an explosive device off New Lodge Road, North Belfast. an explosive device was thrown at a joint British Army-RUC mobile patrol at Springfield Road, west Belfast. 5 January 1990: several shots were fired and a blast bomb thrown at Antrim Road RUC base, Belfast. 9 January 1990: a UDR soldier (Olven Kilpatrick) was shot dead by the IRA on Main Street, Castlederg, County Tyrone. In a follow-up operation, two RUC officers were injured by a bomb left by the IRA unit. the IRA claimed responsibility for a anti-personnel bomb defused by the British Army at Hazelwood, Poleglass, Belfast. The IRA claimed they had aborted the operation because of the presence of civilians. 10 January 1990: the IRA detonated a bomb hidden in a derelict house by command wire as a British Army patrol passed in Stratheden Street in the New Lodge area of Belfast, injuring two soldiers. an IRA unit threw two blast bombs at a three-vehicle British Army-RUC convoy on the Springfield Road, Belfast. The IRA claimed to have scored hits on two of vehicles. 11 January 1990: a part-time UDR soldier escaped injury after he discovered a bomb under his car which was subsequently destroyed when the device exploded in Maghera, County Londonderry. four companies were forced by IRA threats to issue public statements that they would not supply contractors working for British security forces in Northern Ireland. an IRA unit threw a blast bomb into the RUC station in Randalstown, County Antrim. an IRA unit threw a blast bomb into the RUC station in Toomsbridge, County Antrim. 12 January 1990: a bomb caused minor damage to a restaurant on the Lisburn Road, Belfast. petrol bombs were thrown at the RUC base at Coalisland, County Tyrone. 13 January 1990: a bomb caused some damage to the perimeter fence at Lisanelly Barracks, Omagh, County Tyrone. 15 January 1990: a bomb destroyed Sion Mills RUC station. Several homes were extensively damaged, although there were no injuries. A second van bomb, targeting security forces driving to the scene of the first along the Sion Mills road, was defused after failing to detonate. 16 January 1990: the IRA was blamed for two letter bombs defused at Aldershot Garrison in Aldershot, England, both addressed to senior British Army officers. 17 January 1990: the IRA detonated a car bomb in the multi-storey car park of the Victoria Shopping Centre on Chichester Street, Belfast. 18 January 1990: a Semtex bomb was discovered under an RUC Reserve officer's car in East Belfast. A man and a woman were arrested afterwards. A third person was also charged. an attack on a member of the British security forces was apparently foiled after a revolver and of Semtex explosives was found ready in Cookstown, County Tyrone. 20 January 1990: the IRA carried out a mortar attack on the RUC/British Army base at Newtownhamilton, County Armagh. One unexploded projectile landed within the compound, another on civilian property. a UDR soldier was seriously injured when a bomb exploded under his car outside his parents' home at Plumbridge, County Tyrone. 21 January 1990: an IRA unit opened fire on a British Army mobile patrol and an observation post in the New Lodge area of Belfast. There were no reported casualties. 22 January 1990: RUC Inspector Derek Monteith was shot dead by an IRA unit in Kilburn Park, Armagh town. Up to 30 rounds were fired through his kitchen door, hitting him five times in the head, neck and body. the IRA planted a bomb in a snooker hall adjoining Queen Street RUC station in Belfast city centre. The bomb was discovered and defused by the British Army. 27 January 1990: a bomb was found under the car of DUP councillor Paul McLean in Magherafelt, County Londonderry. The IRA said he was targeted because he worked for a firm which supplied the British security forces. a IRA van bomb damaged an RUC station in Lisbellaw, County Fermanagh.