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February 20, 2017

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A police stands by caution tape at the Delaware Valley Charter School Friday, Jan. 17, 2014, in Philadelphia. Police say two students have been shot at the Philadelphia high school.

Matt Rourke / AP

A police stands by caution tape at the Delaware Valley Charter School Friday, Jan. 17, 2014, in Philadelphia. Police say two students have been shot at the Philadelphia high school.