In this April 3, 2014 photo, Northern Illinois University police officer Maria Christiansen explains where she was hit with shotgun pellets during the Feb. 14, 2008 NIU school shooting in which the shooter killed 5 students and injured 21 before turning the gun on himself in DeKalb, Ill. Christiansen has worked as a NIU police officer for 5 years. (AP Photo/Daily Chronicle, Danielle Guerra) MANDATORY CREDIT
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