On the evening of Sunday 3 March 1991, a team from the Mid-Ulster Brigade of the Ulster Volunteer Force (UVF) travelled from Portadown to Cappagh, County Tyrone, intending to kill a local man believed to be a leading figure in the Provisional IRA's East Tyrone Brigade. A second UVF vehicle acted as a "recce vehicle" guiding the attackers into the village, where they waited near Boyle's Bar.
Around 10:30pm, a blue Peugeot 305 arrived outside the bar carrying four IRA members: John Quinn (23), the driver, and passengers Malcolm Nugent (20), Dwayne O'Donnell (17), and Malachy Rafferty (21). Two masked gunmen, one later alleged to be Mark Fulton, opened fire with assault rifles before the car had come to a full stop. Quinn and O'Donnell were killed instantly. Nugent was shot as he tried to flee the vehicle. Rafferty, wounded, remained hidden in the car and survived. Customers inside Boyle's barricaded the door, preventing the gunmen from reaching their original target. One attacker then fired through a toilet window, killing Thomas Armstrong (52), a Catholic civilian sheltering inside. The gunmen then left by car.
The UVF issued a statement describing the attack as directed at the IRA's command structure rather than as sectarian violence against Catholics. Billy Wright, the UVF's Portadown-based leader, was widely credited with organizing the operation, and Special Branch reportedly believed he had overseen it, though some suspected the plan originated in Belfast. Senior UVF figures later disputed Wright's involvement, though this came after Wright had split from the UVF to form the rival Loyalist Volunteer Force, raising questions about their motives.
No one has ever been charged in connection with the killings. Allegations of security-force collusion circulated among Cappagh locals and were amplified by a 1991 Channel 4 Dispatches programme. Commentators and authors have since debated whether the attackers had advance intelligence about the victims' movements or whether the deaths of the three IRA men were an unplanned "bonus" alongside the intended attack. A 2020 report by the Historical Enquiries Team confirmed that three serving Ulster Defence Regiment soldiers were arrested in December 1991 and questioned, but were released without charge.
In the aftermath, the IRA killed a builder, Derek Ferguson, in April 1991, reportedly in retaliation, though his links to the UVF were denied by his family, the RUC, and the UVF itself. Billy Wright was later killed inside the Maze Prison in December 1997 by an INLA prisoner, following several earlier failed IRA assassination attempts against him.