Shootout in American Theater,12 people dead and 50 injured

A man in mask attacked the people seeing the premier show of Batman film in an US theater . He caused a damage of killing 12people and left 50 injured by the attack.He was caught by the police officials of US.He marched into the  theater  in Aurora, a suburb of Denver,Colorado  and attacked innocent people leaving it to be a worst mass attack since 2007.