At least 12 people are dead after a shooting at a movie theater in suburban Denver, police said early Friday morning. (Initial reports said 14 had been killed.) The gunfire reportedly broke out during a screening of The Dark Knight Rises. Moviegoers were in the theater when they say the shooter “released some sort of canister. They heard a hissing sound, and some gas emerged, and the gunman opened fire,” according to Aurora Police Chief Dan Oates. At least 50 other people have been injured, and one person arrested. Police haven’t found evidence of more than one shooter.