On 3 March 1991 , the Ulster Volunteer Force carried out an attack at the village of Cappagh , killing three IRA members . The IRA subsequently stated its belief that this attack could have been carried out only with the connivance of the British state forces . On 9 April 1991 , the IRA 's East Tyrone Brigade shot dead Derek Ferguson in Coagh ( a cousin of local Member of Parliament Reverend William McCrea ) , stating afterward that he was a paramilitary with the Ulster Volunteer Force . Ferguson 's family subsequently refuted that he had anything to do with Loyalist paramilitarism Historian Kevin Toolis includes as part of this cycle of violence the destruction of Glenanne UDR barracks in nearby County Armagh , in which three soldiers were killed and 10 injured by an IRA truck bomb on 30 May . The IRA later claimed the killings of 3 of its members that followed in Coagh was a retaliation by the British Army for the Glenanne bombing
destruction of Glenanne UDR barracks
Glenanne barracks bombing
Coagh ambush