Building fire - Market Ward - Cambridge
Crews for Papworth and Burwell, along with one from Suffolk, were called to a fire in a toilet in Park Street.
Firefighters used a hose reel to extinguish the fire and returned to their station by 5.37am.
A male casualty at the scene suffered smoke inhalation.
Cause of the fire was deliberate.
Anyone with information should contact police on 101 or call Crimestoppers anonymously on 0800 555 111.