The SAS conducted a large number of operations officially called "OP/React": acting on information provided by a range of sources, including informers and technical intelligence. The Det, MI5 and the RUC's E4a surveillance unit would target and track ASU terrorists until a terrorist operation was thought to be imminent; at that point, the SAS were handed control and would plan an arrest operation, and if the terrorists were armed and did not comply they would be engaged. In December 1984, a SAS team killed two ASU terrorists who were attempting to assassinate a reserve soldier outside a hospital he worked at. In February 1985, three SAS operators killed three ASU terrorists in Strabane. The terrorists were tasked with attacking a RUC Land Rover with anti-tank grenades, but having failed to find a suitable target they were visiting a weapons cache to store their weapons. There was considerable media speculation during 'the Troubles' and allegations of so-called "shoot-to-kill" policy by the SAS; the allegations mainly focus on whether a terrorist could have been captured alive rather than killed. The PIRA never took prisoners except for the worst intentions and after the 1980 death of Captain Westmacott and the death of a SAS member in December 1984, the Regiment appeared to adopt an unofficial policy of what Mark Urban quoted SAS sources as calling "Big boys' games- big boys' rules": if you're an armed terrorist you can expect no quarter to be given.