In this still frame image taken from video provided by the Texas Rangers and recorded on Sept. 8, 2016, armed law enforcement officers move through a hallway at Alpine High School in Alpine, Texas, while responding to a shooting at the school. A Homeland Security Investigations Special Agent was wounded during the response after a gun carried by U.S. Marshal Douglas Mullens, upper-right, accidentally discharged. (Courtesy of Texas Rangers via AP)
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