Armed officers raided this afternoon a property in Thesiger Street in Lincoln after they arrested a man earlier today on the A46 outside Dunholme.
Eyewitness reports said there were six police vehicles on scene, and some of the officers were armed. The dog search unit attended too.
This is an ongoing live investigation in which there is not believed to be any threat to the public, but officers will remain in the area of the property for some time as enquiries continue.
The arrested man has been detained by investigating officers for questioning.