Fire crews from Huntingdon and St Neots were called to a building in Edison Bell Way, at about 6.30pm. A spokesman for Cambridgeshire Fire and Rescue Service said: Two firefighters wearing breathing apparatus used a hose reel to extinguish a fire in a portable building used as storage. Crews returned to their stations by 7.30pm. An investigation determined that the cause of the fire was deliberate. Anyone with information should contact the police on 101 or the independent charity Crimestoppers anonymously on 0800 555111.