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Witness describes Batman US cinema shooting

20 July 2012 Last updated at 17:16 BST

At least 12 people have been killed and dozens wounded in a shooting at a midnight cinema showing of the new Batman film near Denver, Colorado.

Witnesses said a man wearing a gas mask opened fire after tossing a tear gas canister in the auditorium as movie-goers watched The Dark Knight Rises.

A 24-year-old local man was arrested in a car park nearby in possession of a rifle, handgun and knife.

One young woman described what she saw as she fled the theatre.