An explosion has ripped through a house in Bodmin, blowing off the roof and a side of the building.A fierce fire broke out after the blast at Margaret\'s Crescent just before 21:00 BST on Tuesday.Police were called in to control traffic and ambulance crews were at the scene, but a spokesman said no-one was hurt.Engineers from Western Power had to dig up the pavement to cut off the electrics to the house.More than 20 firefighters from Bodmin and Lostwithiel battled the blaze.A full police and fire investigation will get under way later.