An accident during filming started a fire on the set of "Harry Potter and the Deathly Hallows" in the UK on Friday night reports The Coventry Telegraph.
Second-unit filming of the 'Battle of Hogwarts' climax, which required many pyrotechnics, got out of control as a "mocked-up castle made of timber, steel and plastic" managed to catch fire and kept burning until firefighters managed to extinguish it 40 minutes later.
None of the main cast were on set and none of the 100 crew members and some cast that were on hand for the scene were injured. However initial reports claimed that the exterior Hogwarts castle set was almost completely destroyed with damages estimated to be in the range of £100,000.
A representative for the production told The Watford Observer that Leavesden studio wasn't damaged at all by the fire which was very limited and contained. They also added that "The actual set was due to be rebuilt anyway. The scene was where the set was being destroyed and then it was to be rebuilt for a new scene, as part of a battle for 'Deathly Hallows, Part Two'."