A major IRA attack in County Tyrone took place on 20 August 1988, barely a year after Loughall, which ended in the deaths of eight soldiers when a British Army bus was bombed at Curr Road, near Ballygawley. The soldiers were being transported from RAF Aldergrove to a military base near Omagh after returning from leave in England. This attack forced the British military to ferry their troops to and from East Tyrone by helicopter. On 30 August 1988, an SAS ambush killed IRA members Gerard Harte, Martin Harte and Brian Mullin as they tried to kill an off-duty Ulster Defence Regiment member near Carrickmore. British intelligence identified them as the perpetrators of the attack on the military bus at Curr Road. On 16 September 1989, a British sergeant of the Royal Corps of Signals (Kevin Froggett) was shot and killed by an IRA sniper while he was repairing a radio mast at Coalisland Army/RUC base.