Moviegoers inside a Denver, Colorado theater thought the gas they saw and shots they heard were part of a screening of 'The Dark Knight Rises' they were watching. In reality, a gunman had begun to open fire on the crowd. Today, police confirm 12 are dead and as many as 38 others are injured following the deadly spree.
Click READ MORE for video from the scene.
WARNING: VIDEO IS RAW AND CONTAINS DISTURBING IMAGES