A recently published YouTube video captured the heart-wrenching moments after the massacre at cineplex outside Denver.
Friday, shortly after 12 a.m., 12 people were shot to death at the Century Aurora 16 movie theater at 14300 East Alameda Avenue in Aurora, Colorado.
An undetermined number of people were pronounced dead on the scene and others died at local hospitals, according to various news reports.
Prior to the shooting, a 24-year-old James Holmes threw teargas into the theater, said police.
Investigators said when moviegoers tried to escape the fumes, the Holmes started shooting.
In addition to the fatalities, at least 50 people, including a 3-month-old baby and a 6-year-old girl, were injured in the gunfire.