Fire at St Andrew's Hospital, Thorpe St Andrew, believed to be arson
Police believe a fire at a derelict hospital was started deliberately.
Norfolk Constabulary said an "incident of arson" at the former St Andrew's Hospital in Thorpe St Andrew, near Norwich, was reported at 05:38 BST on Thursday.
Norfolk Fire and Rescue Service sent seven fire appliances and an aerial ladder platform.
Police said no-one was believed to be injured, and they are appealing for witnesses.
They added that "emergency services remain at scene and a cordon is in place while investigations continue."
Follow East of England news on Facebook, Instagram and X. Got a story? Email [email protected] or WhatsApp 0800 169 1830