On the night of 16 October 1976, the Gardaí received an anonymous telephone call stating that Provisional IRA members were at a vacant farm at Garryhinch, near
Portarlington, County Laois, engaged in activity connected with a plot to target a local
Fine Gael TD and Parliamentary Secretary to the Minister of Defence,
Oliver J. Flanagan. Garda (equivalent rank to
constable in other police forces) Clerkin and four fellow Gardaí (Detective Garda Tom Peters, Sergeant Jim Cannon, Detective Garda Ben Thornton, and Garda Gerry Bohan) were dispatched from Portarlington Garda Station to investigate the report. However, the telephone call was bogus and was from the IRA itself, aimed at luring Garda officers to the farmhouse as a part of a planned ambush by the organisation against the Irish Government in retaliation for its institution of the 'Emergency Powers Act' (1976), which passed into Irish Statute that same night, aimed at combating escalating paramilitary activity within the
Republic of Ireland associated with the IRA's
armed campaign. Garda Clerkin, despite being an ordinary uniformed and unarmed garda, entered the premises via an open rear window, and moved through the building finding it to be apparently deserted; he opened the front door from within to admit his colleagues. The door was
booby-trapped with a
bomb, housed in a large used
propane gas cylinder which had been dug into the ground beneath the floorboards of the farmhouse's entrance doorway, which was triggered and detonated upon the door being opened, killing Clerkin standing directly above instantly. On the building's outside, the rest of the Garda team were also caught in the blast, Detective Garda Peters being permanently blinded and deafened, and Det. Gda. Cannon, Det. Gda. Thornton and Garda Bohan also being wounded, the quantity of explosives utilised being of sufficient power to demolish the building. Clerkin was in his 25th year. ==Aftermath==