School Stabbing: The 9 Most Dramatic Images

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A 16-year-old student went on a stabbing spree Wednesday morning at a high school in Murrysville, Pa. Here's how it all unfolded.

April 10, 2014, 11:05 AM EDT / Updated April 10, 2014, 11:05 AM EDT

By Ronnie Polidoro

School Stabbing Spree: A 16-year-old student injured 22 people at a suburban high school outside of Pittsburgh on Wednesday.

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School Stabbing: First Responders’ Horrifying Moments

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Ronnie Polidoro

Ronnie Polidoro is a producer for "NBC Nightly News with Brian Williams" in New York. He would like you to hold your phone horizontally when taking video.

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