Part of Leeds City Centre was closed to the public this week in 1981, as the emergency services cordoned off several streets.
The incident resulted in specialist bomb disposal teams being called in and the deployment of a remote controlled robot on the streets of the city.
Workers in the surrounding buildings were put on lockdown while the operation took place, but some managed to sneak a few pictures of the incident as events unfolded.
The drama happened on Great George Street, near Calverley Street, just down from the Merrion Centre, which is obscured at the top of the picture by a bus.
A specialised robot can be seen moving across the street, tethered to a wire, which was used to control it’s direction and its mechanical arm.
It is heading towards a suspect package - a briefcase - which had been left at the back of a parked white Ford motorcar.
The incident followed a bombing in London in January, which killed two people and which was later claimed by the Provisional IRA.