Harry Potter Daniel Radcliffe's stunt double is in a serious condition in hospital after a flying sequence on another installment being filmed went wrong. The crew is currently on pre-production scenes for upcoming picture, Harry Potter and The Deathly Hallows, the seventh film in the wizard series, at Leavesden Studios in Watford, England. The unnamed 25-year-old stuntman, who doubles for star Radcliffe, was rehearsing an ariel sequence yesterday, when he was sent plummeting to the ground following an explosion which was part of the huge stunt.The man was immediately attended by paramedics and rushed to the nearby Watford General Hospital to be treated for a "significant back injury". A source tells British newspaper the Daily Mirror, "The stunt double was badly hurt. The scene seems to have gone badly wrong. The guy was rigged up to a harness and was flying through the air. It is thought he may have been caught in the explosion and hit the ground very hard. He told crew members who went to help him that he couldn’t feel anything from the waist down. Everyone is hoping he makes a good recovery. It has come as a terrible shock." A statement from studio executives adds, "We can confirm a member of the Harry Potter production was injured in an accident. We are awaiting further news. Out of respect for the family we are unable to comment any further."