At 1.48am on Wednesday (2) two crews from Wisbech and one crew from West Walton in Norfolk were called to a fire on Chapel Road in Wisbech.
Firefighters arrived to find a fire in a first floor flat. Wearing breathing apparatus they extinguished the fire using a hose reel and returned to their stations by 4.15am.
The cause of the fire was deliberate. Anyone with information should contact police on 101 or Crimestoppers on 0800 555111.