At 9.11pm on Thursday (25) one crew from the Peterborough Volunteers Fire Brigade and one crew from Yaxley were called to a fire on Padholme Road in Eastfield, Peterborough.
Firefighters arrived to find a fire in a house. Wearing breathing apparatus they extinguished the fire using a hose reel and cleared the smoke using a positive pressure ventilation fan.
The crews returned to their stations by 10.30pm.
The cause of the fire was deliberate. Anyone with information should contact police by visiting www.cambs.police.uk to submit an online report or call Crimestoppers on 0800 555111.