Edited sentence: 18 January 1997: An IRA unit fired two mortars at an armoured RUC patrol in Downpatrick, County Down.20 January 1997: An IRA unit hurled two explosive devices at a British armoured vehicle as it left Mountpottinger RUC barracks.22 February 1997: An IRA mortar unit was intercepted by the RUC on it's way to carry out an attack on a British Army installation in Tyrone.26 June 1997: Am IRA unit fired an RPG-7 at a British armoured patrol in north Belfast.29 April 1997: Britain's transport industry claimed minimum losses of £30 million after a series of IRA bomb alerts in southern England brought traffic to a standstill.A five-mile chase followed before the IRA volunteers managed to escape on foot.The rocket bounced off the vehicle and exploded in an empty building.There were no injuries.This was the first time the IRA used an RPG-7 since the first ceasefire