Students Injured in US School Stabbing

Emergency responders gather in the parking lot of the campus of the Franklin Regional School District, where several people were stabbed at Franklin Regional High School, Murrysville, Pennsylvania, April 9, 2014.

Students leave the campus of the Franklin Regional School District where several people were stabbed at Franklin Regional High School in Murrysville, Pennsylvania, April 9, 2014.

A woman walks onto the campus of the Franklin Regional School District where several people were stabbed at Franklin Regional High School, Murrysville, Pennsylvania, April 9, 2014.

Emergency responders gather on the campus of the Franklin Regional School District where several people were stabbed at Franklin Regional High School, Myrrysville, Pennsylvania, April 9, 2014.