iReport — Dallas, TX - The American Airlines Center, home of the 2011 NBA Champions was evacuated tonight during the Rihanna concert due to a fire that was caused by pyrotechnics used in the show.  The show was abruptly cancelled and all concert goers were asked to leave the building.  This further aggravated the audience of several thousand who had already waited for over two hours for Rihanna who went on stage hours after schedule.