On 27 August 1979, 16 men of the 2nd Battalion, Parachute Regiment, and two from the Queen's Own Highlanders (QOH) were killed in the Warrenpoint ambush. The first six Paras were killed while travelling in a small convoy of three vehicles. As it passed a roadside bomb hidden in a lorry by the Provisional Irish Republican Army (PIRA), the bomb exploded. The PIRA had studied how the Army reacted after a bombing and correctly guessed that they would set up an incident command point in the nearby gatehouse. A second bomb detonated 32 minutes later, killing 10 Paras and two men from the QOH, one being Lieutenant-Colonel David Blair, their commanding officer. After the first explosion, the soldiers, believing that they had come under attack from the IRA, began firing across the narrow maritime border with the Republic of Ireland, a distance of only 57 m (187 feet). An uninvolved civilian, Michael Hudson (an Englishman whose father was a coachman at Buckingham Palace) was killed as a result, and his cousin Barry Hudson wounded. According to RUC researchers, the soldiers may have mistaken the sound of ammunition cooking off from the destroyed Land Rover for enemy gunfire from across the border. The Paras were under orders not to pursue their attackers into the Republic to avoid causing any diplomatic incidents. The death toll in the Warrenpoint ambush is the highest suffered by the British Army in a single incident in Northern Ireland.