Continued from page 2

The shooting at Roosevelt comes amid a string of violence in recent months involving students at U.S. schools.

On Monday, a 16-year-old boy set himself on fire at a suburban Denver high school in an apparent suicide attempt. And earlier this month, a seventh-grader opened fire in a Roswell, N.M., middle school gym, wounding a 12-year-old boy and 13-year-old girl.

In Philadelphia, a boy and a girl hanging out with fellow students this month in a high school gym were shot and wounded.

Last month, a student gunman in Centennial, Colo., shot and killed a 17-year-old classmate before killing himself — a day before the one-year anniversary of the Newtown, Conn., school shooting.