Tom Sullivan holds up a photo of his son Alex Sullivan pleading the media to help find him, outside Gateway High School a few blocks from the scene of the Century 16 Theatre shootings in Aurora, Colorado July 20, 2012. A gunman in a gas mask and bullet-proof vest killed 12 people at a midnight premiere of the new Batman movie in a suburb of Denver early on Friday, sparking pandemonium when he hurled a gas canister into the auditorium and opened fire on moviegoers. REUTERS/ Evan Semon (UNITED STATES - Tags: CRIME LAW SOCIETY TPX IMAGES OF THE DAY)