Armed officers are currently in the area of Warbreck Hill, Blackpool, following reports a man had been seen with a firearm.
Lime Grove is currently closed and there is some disruption in the area but Police say this is being kept to a minimum.
Although Police do not believe there to be a wider threat to the public they are asking people to stay away from the area, and staff at a nearby offices have been advised to stay indoors as a precaution.
The Force Incident Manager at Lancashire Constabulary later told Radio Wave (1920) that the search was continuing with help from the Force helicopter which had been seen circling an area around Layton and North Shore.
Workers at DWP Warbreck House had been escorted off the premises, but armed officers remained on duty on the gate.