Ten people are feared dead after a gun attack at a midnight screening of the latest Batman movie, according to news reports.
A gunman in a gas mask opened fire at a cinema in Denver, Colorado, and set off a smoke or tear gas canister, local radio said.
The attack took place at the Century 16 cinema in the Denver suburb of Aurora.
Police, fire fighters and emergency crews were at the scene today.
An area around the Aurora mall was closed off and passers-by were prevented from entering the area.