(PITTSBURGH POST-GAZETTE) Twenty people were injured — four critically — when a teenager wielding two knives started attacking students at Franklin Regional Senior High School in Murrysville. All of the injured were students with the exception of an adult security guard.
Westmoreland County public safety spokesman Dan Stevens said the suspect, a 16-year-old, is in custody and was questioned by Murrysville police and Westmoreland County detectives before being taken to a hospital for treatment of minor injuries to his hands.
Authorities said the teen showed two knives in the attacks, but they didn't say what kind or why. Murrysville police Chief Thomas Seefeld said a motive is still unclear.
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"We don't know what led up to this," he said.