Witnesses say a 16-year-old boy began indiscriminately stabbing and slashing just as classes were about to start at a high school in Murrysville, Pa. Twenty one people were injured in the rampage that... more 
Witnesses say a 16-year-old boy began indiscriminately stabbing and slashing just as classes were about to start at a high school in Murrysville, Pa. Twenty one people were injured in the rampage that ended when a campus police officer and a vice principal tackled the suspect. Vinita Nair reports. less 
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Wed, Apr 9, 2014 8:56 PM EDT