Four people, including an armed suspect, died during an hours-long police stand-off at a Colorado house.

A gunman shot three people dead before being killed by police after a siege at a Colorado house today.

US police have begun the intricate process of disarming booby traps in the apartment of the suspect behind the Colorado cinema shootings, hoping to find clues to the motive for the rampage without causing an explosion that could destroy key evidence.

Investigators looking for clues to the motive behind a shooting rampage at a screening of the new Batman movie sought to enter the suspect's elaborately booby-trapped apartment today.

Up to 14 people are feared dead after a shooting at a midnight screening of the latest Batman movie near Denver, Colorado, according to local police.