Reply #10: and more answers [View All]

[iverglas]

From the same WP article:

After being absent from the class for several weeks, Hamilton returned with a fury Tuesday, police and eyewitnesses said. A long, black canvas bag at his side, he stood outside the classroom door in the main administration building as other students filed in.

... He pointed the .30-06 rifle with a 26-inch barrel at the professor and fired, police said.