Police officers are at the scene after a man was seen on top of a tower block in Lincoln.
A large police response was sent to Shuttleworth House at Stamp End in Lincoln.
The incident was reported to police at 11.20am and is ongoing at the time of publication.
Lincolnshire Police said: “Our officers are at Shuttleworth House in Lincoln dealing with an incident involving a man whose safety we are concerned about.
“Please avoid the area so our officers can help and keep everyone safe.”