People participate in a vigil for victims behind the theatre where a gunman opened fire on moviegoers in Aurora, Colorado July 22, 2012. Residents of a Denver suburb mourned their dead on Sunday from a shooting rampage by a "demonic" gunman who killed 12 people and wounded 58 after opening fire at a cinema showing the new Batman movie. President Barack Obama headed to Aurora, on Sunday to meet families grieving their losses in Friday's mass shooting that has stunned the nation and rekindled debate about guns and violence in America. REUTERS/Shannon Stapleton (UNITED STATES - Tags: DISASTER SOCIETY CIVIL UNREST)