A man who survived the Denver Batman shootings has spoken about his ordeal from his hospital bed.

Stephen Parton, a resident of the state of Connecticut, was biking cross-country with a friend when the pair stopped in Aurora to catch the premiere of the latest Batman movie.

Parton was wounded in the shooting and he recalled the tragic events while hospitalised in bed: "At around 12:30, there was sort of a solemn moment in the movie and a canister sort of type thing... I guess it was a gas canister, kind of flew across the screen and landed kind of in front of me and to the side.

"The people there started to get out of their seats and started moving. And then... from the bottom right corner of the theatre, there started the muzzle flash of the gun. At the time, I thought it was still fireworks," Parton said.

In total, 12 people died and 50 were injured in the shooting rampage, during a screening of the new Batman film.

Several of those hospitalised remain in a critical condition.