A San Diego police officer stands in front of the home of the mother of Colorado shooting suspect James Holmes Friday, July 20, 2012, in San Diego. A gunman wearing a gas mask set off an unknown gas and fired into a crowded Colorado movie theater at a midnight opening of the latest Batman movie, killing at least 12 people and injuring many others, authorities said. (AP Photo/Gregory Bull)

Associated Press
A San Diego police officer stands in front of the home of the mother of Colorado shooting suspect James Holmes Friday, July 20, 2012, in San Diego. A gunman wearing a gas mask set off an unknown gas and fired into a crowded Colorado movie theater at a midnight opening of the latest Batman movie, killing at least 12 people and injuring many others, authorities said. (AP Photo/Gregory Bull)
A San Diego police officer stands in front of the home of the mother of Colorado shooting suspect James Holmes Friday, July 20, 2012, in San Diego. A gunman wearing a gas mask set off an unknown gas and fired into a crowded Colorado movie theater at a midnight opening of the latest Batman movie, killing at least 12 people and injuring many others, authorities said. (AP Photo/Gregory Bull)
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