With today's sentencing of T.J. Lane, look back at other major school shootings in U.S. history.
March 24, 1998: Two boys, ages 11 and 13, fired on Jonesboro Middle School in Jonesboro, Ark., from nearby woods, killing four girls and a teacher and wounding 10 others. Both boys were later convicted of murder.
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ERIC THAYER / Reuters
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