BBC News reports that witnesses said a man wearing a gas mask opened fire after tossing a tear gas canister at a midnight showing of The Dark Knight Rises.
Bloomberg reports that police found explosives in the home of the 24-year-old man arrested in a car at the shopping mall that housed the theater, Aurora Police Chief Dan Oates told reporters.
'We have no evidence of additional shooters', Oates said.'The gunman was found in a car in the parking lot with a rifle, handgun, gas mask'.
Reuters reports that Wendy Post, who was waiting to be reunited with her daughter at a local high school following the shooting, said her daughter told her the shooting erupted just minutes after the film began.
'She saw the exit door open and something was thrown across the screen, and then shooting started', she told local NBC affiliate 9News television. 'It was chaos'.
President Barack Obama, who was notified of the shooting on Friday morning by his homeland security adviser, John Brennan, urged Americans to 'stand together' with the people of Aurora in the hours and days to come.
The FBI has said that there is no evidence so far to suggest any links to a terror cell.
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