Pennsylvania High School Stabbing Spree

As many as 20 students were hurt, some with life-threatening wounds, when a classmate went on a stabbing rampage through the classrooms and halls of a high school outside Pittsburgh on Wednesday morning, authorities said.

The school district posted an emergency message on its website on Wednesday. "A critical incident has occurred at the high school," the message said. "All elementary schools are canceled, the middle school and high school students are secure."

The suspected attacker is in police custody.
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