[This story was updated at 1:22 p.m. ET on Friday, July 20, 2012 when the death toll was revised upward to 13.]

A total of 13 people were killed and 50 wounded early Friday when a gunman opened fire at a crowded premiere of the new Batman movie in the US state of Colorado, the local police chief said. [Editor's note: Police initially said 14 people were killed, but that figure was later revised.]

Police arrested an alleged gunmen and were searching for another following chaotic scenes at a midnight showing of "The Dark Knight Rises," the latest Batman movie, according to KDVR, a local Fox affiliate.

The nearby University of Colorado hospital received 20 people with minor to severe injuries, hospital spokeswoman Jackie Montgomery told CNN before the interview was cut short due to technical difficulties.

KDVR said the shooting was carried out by two gunmen in separate theaters who sowed panic with tear gas.

Aurora is a suburb of Denver near the scene of the 1999 Columbine High School shooting, in which 13 people were shot dead and another 24 were wounded.


Photo: Screenshot via CBS Denver.

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