A woman walks across an empty parking lot a Columbine High School, Wednesday, April 17, 2019, in Littleton, Colo., where two student killed 12 classmates and a teacher in 1999. The school was closed along with hundreds of others in Colorado after an armed young Florida woman who was allegedly "infatuated" with Columbine threatened violence just days ahead of the 20th anniversary of the attack. (AP Photo/Joe Mahoney)
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