The British Army’s Explosive Ordnance Disposal (EOD) carried out a controlled explosion at the Lincolnshire Police headquarters in Nettleham.
Lincolnshire Police have assured the public there is no cause for alarm.
The force appear to have received calls from concerned residents after noise of the explosion was heard at the HQ on Deepdale Lane on Monday, November 27.
The action came after the recovery of a historical explosive device from an address in Bunkers Hill.
Assistant Chief Constable Shaun West took to Twitter to reassure members of the public.
He said: “Thank you for all your calls. No cause for alarm.
“The noise heard in Nettleham earlier was a controlled explosion at the Lincolnshire Police HQ by the British Army’s Explosive Ordnance Disposal (EOD).
“This follows the recovery of historical explosives from an enquiry at an address in Bunkers Hill.”