The Irish Republican Army (IRA) campaign designed to stop firms in Northern Ireland supplying materials to the security forces has this week forced four companies to give a public assurance they will not supply contractors undertaking work for the Royal Ulster Constabulary (RUC) or British Army.
Report shows newspaper announcements by companies.
Aftermath of explosion at Ballygawley RUC Station.
November 1989 scene of killing of contractor Robert Glover near Dungannon by an IRA bomb.
The reporter is Brendan Wright.