Bomb disposal experts were called to a police station in Leeds yesterday after a member of the public turned up with a suspected hand grenade.
Police said the man had discovered what appeared to be a grenade while clearing out the home of a deceased relative.
He arrived at Weetwood Police Station at around 2pm when he told officers about the item, which he had left in his car outside the station.
It triggered the evacuation of the area until the army’s bomb squad arrived to make an assessment of its safety.
A cordon was put in place around the station, forcing the closure of the A660 Otley Road in both directions between the A6120 Leeds Outer Ring Road and Otley Old Road.
It meant delays of more than an hour for bus passengers as a number of services had to be diverted from their usual routes.
A West Yorkshire Police spokesman said the road reopened at around 5.30pm after the grenade was declared safe.