Law enforcement personnel gather at a Fort Pierce, Fla. residence related to the Orlando shooter, Omar Mateen, Sunday, June 12, 2016. Mateen is named as the gunman wielding an assault-type rifle and a handgun who opened fire inside a crowded gay nightclub early Sunday, before dying in a gunfight with SWAT officers, police said. It was the worst mass shooting in American history. (/South Florida Sun-Sentinel via AP)
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