Mourners Observe a Moment of Silence in Tucson....Flags Fly at Half-Staff Day after Assassination Attempt Against U.S. Rep Giffords in Florence, Arizona

Mourners observe a national moment of silence at 9 A.M. MDT two days after a young gunman shot and killed six people incuding U.S District Judge John Roll and critically wounded U.S Representative Gabrielle Giffords in Florence, Arizona on January 9, 2011. The assassination attempt occurred near a northern Safeway in Tucson on January 8, 2011. UPI/Gary C. Caskey