A heart shaped balloon hovered above a memorial for victims outside the Century 16 movie theater in Aurora, Colo., last week. Joe Raedle/Getty Images hide caption

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A photo released by Prince George's County (Md.) police of the weapons seized. Prince George's Police Department hide caption

itoggle caption Prince George's Police Department

An ambulance and police cars outside the Century 16 movie theater complex in Aurora, Colo, during the early hours of July 20, 2012. A gunman attacked an audience there — killing 12 people and wounding 58. Bob Pearson/EPA /Landov hide caption

itoggle caption Bob Pearson/EPA /Landov