Durham city centre was in lockdown on Monday evening after historical explosive devices were handed in at a police station.
Several nearby office buildings were evacuated as bomb disposal experts worked to remove them.
Experts carried out a controlled detonation in a nearby sports ground.
Police said the items were handed in to the front desk at the station.
A statement from Durham Police said: “A number of historical explosive devices have been handed in to Durham City Police Station.
“Bomb disposal experts from Catterick Garrison are currently on scene and are facilitating the safe removal and disposal of the devices.
Source: Sky News