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Harry Potter star Daniel Radcliffe’s stunt double suffered a horror injury in a film set explosion yesterday.

The 25-year-old was rehearsing a flying sequence using a harness when he was sent plummeting by the blast, which was part of the stunt. He was conscious after smashing to the ground but told horrified colleagues: “I can’t feel my legs.”

The 25-year-old, who doubles for Harry star Daniel Radcliffe, was sent plunging yesterday by an explosion that was part of the stunt.

A source said: “The stunt double was badly hurt. He was rehearsing a flying scene which involved an explosion and it seems to have gone badly wrong. The guy was rigged up to a harness for the scene and was flying through the air.

“It is thought he may have been caught by the explosion and hit the ground very hard.

“He told crew members who went to help him he couldn’t feel anything from the waist down. Everyone is just hoping he makes a good recovery. It has come as a terrible shock.” Paramedics were called to the studio and the stuntman was taken to hospital amid fears he may have been paralysed.

The accident happened at the world famous Leavesden studios near Watford, where tests are being carried out on stunts for Harry Potter and the Deathly Hallows.

A spokesman for the studio said: “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 further.”

It is not thought Radcliffe or any of the other major stars were involved yesterday.

The crew are doing pre-production work on the movie, the seventh in the Harry Potter series. The sixth film, Harry Potter and the Half Blood Prince, has been completed and is due out later this year. Deathly Hallows is the final book in the Potter series. It will be made into two films – the first of which will be out in 2010.

Leavesden has been used to film scenes for all of the Harry Potter movies to date.

It is the site of a former airfield and Rolls-Royce engine factory. It has also previously been used to film sequences from the James Bond and Star Wars movies.

In the Potter films, the studio provides the permanent home for Dumbledore’s study, the exterior set of Privet Drive and Hagrid’s hut.

But many other scenes, often involving hi-tech digital imagery, are filmed in the studios hangers.

Actor Brandon Lee was killed there during a stunt in 1993 while filming horror movie The Crow.

Lee, the son of Kung Fu legend Bruce, was killed by a bullet that lodged in his spine when a gun mistakenly thought to contain dummy bullets was fired at him. He died in hospital.

The curse of Harry Potter