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School Stabbing: The 9 Most Dramatic Images

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