Video - National News
Posted on April 9, 2014 at 6:16 AM
Updated Wednesday, Apr 9 at 1:39 PM
A 16-year-old armed with two knives went on a stabbing and slashing spree at a high school near Pittsburgh on Wednesday, leaving 20 people injured, including a school police officer who eventually subdued him with the help of an assistant principal.
More National News Videos