The theft occurred at Beccles Airfield on Brock Road, North Cove, between 6pm on Sunday, July 26, and 5am on Monday, July 27. The suspects gained access to the site and were able to siphon diesel from a number of vehicles after breaking off the fuel caps. Officers are now asking anyone who witnessed suspicious activity in the area or has information about the incident to contact Suffolk Police quoting crime reference 37/44415/26.