Firefighters from Ramsey and Huntingdon were called to the airbase at 9.10pm on Saturday (March 23) and arrived to find a fire involving pallets. A Cambridgeshire Fire and Resuce Service spokesman said four youths were escorted from the building and confirmed the fire was deliberately started. The crews returned to their base by 10.30pm. A Cambridgeshire police spokesman said: We were called to reports of a small fire in a derelict building at RAF Upwood at 9.07pm on Saturday. Officers attended and stop-checked four youths nearby.