Armed police and helicopters were in the streets and skies above Lincoln and North Hykeham after residents falsely reported a man walking around carrying a gun.
Eyewitness reports have claimed that a man had been spotted walking around the Meadow Lane and Tiber Road area of North Hykeham wearing a stab vest and carrying a pistol.
Police vehicles and a helicopter were seen scouring the scene.
Another eyewitness said that armed police “pulled someone over” outside the Evans Halshaw car dealership on Newark Road.
A spokesperson for Lincolnshire Police said: “We have been in the North Hykeham and Brant Road area this morning following reports of a man in possession of a weapon.
“After carrying out searches with officers from armed response vehicles and the police helicopter we believe the call was made in good faith but was incorrect.
“This was a standard response to an incident of this nature and we always act in this manner to ensure public safety.”