A gunman opened fire early Friday at a suburban Denver movie theater on the opening night of the latest Batman movie “The Dark Knight Rises,” killing 14 people and injuring at least 50 others, authorities said.

The gunman, who is in custody, stood at the front of the theater and fired into the crowd about 12:30 a.m. MDT at a theater at a multiplex theater in a mall in Aurora.

“Witnesses tell us he released some sort of canister. They heard a hissing sound and some gas emerged and the gunman opened fire,” Aurora Police Chief Dan Oates said at a news conference.