Police: Colorado gunman booby trapped apartment

From the battleground to your backyard, are improvised explosive devices becoming commonplace here? CNN's Miguel Marquez reports.

Sources: Robots may be needed to clear suspect's apartment

At least 12 people were killed and another 59 wounded when a gunman opened fire during an early Friday morning screening of the new Batman movie at an Aurora, Colorado, theater, Police Chief Dan Oates told reporters. (Earlier, police said 14 were dead and 38 wounded.)

The heavily armed suspect has been identified as James Holmes, a 24-year-old Aurora resident who had been a doctoral student at the University of Colorado. He was arrested without putting up a fight at the theater moments after police arrived, Oates said.

Chaos broke out during the showing of "The Dark Knight Rises" at the Century Aurora 16 theater when the shooting began, police and witnesses said. A man told CNN affiliate KUSA that people were confused when the shooting started because many believed the sound of gunfire was coming from the movie.

According to Oates, Holmes' apartment housed a device with "incendiary devices, some chemical elements linked together with all kinds of wires."

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