As many as 20 students have been injured in a mass stabbing at a high school in the US state of Pennsylvania, authorities have said. One suspect believed to be a student is in custody at Franklin Regional High School in a suburb of Pittsburgh, a local affiliate of ABC News reports. The wounded, many with significant injuries, range in age from 14-21 and have been taken to hospital. The school was locked down as police searched the premises. "These are all significant stab wounds," said Dr Chris Kauffman, a doctor at nearby Forbes Regional Hospital. He said several were either in the operating room or being prepped for surgery.
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