Wonder why people feel the need to shoot other students in the US? Bizarre.
CNN

CNN
There are about 162 registered students in the class that met in the large lecture hall.
A student described the classroom as having four exits -- two at the front and two at the rear.
"Witnesses say someone dressed in black came out from behind a screen in the front of the classroom and opened fire with a shotgun," Peters said.
At 3:03 p.m., NIU police responded, and four minutes later, the campus was ordered into "a lockdown situation," Grady said.
At 3:20, an all-campus alert went out via the campus Web site, e-mail, voice mail, the campus crisis hotline, the news media and various alarm systems, he said.
"The message basically was: There's a gunman on campus, stay where you are; make yourself as safe as possible," he said.
Rosie Moroni, a student at the school, told CNN she was outside Cole Hall near the King Commons when she heard shots coming from the classroom she was heading to.
The shot was followed by "a lot of people screaming," then people ran out the doors yelling, "He's got a gun, call 911," she said.
"It was complete chaos. It's very scary here right now."
By 4 p.m., DeKalb police had swept the area "and determined there was only one gunman" and that he was dead.
Grady said the man used three guns: a shotgun, a Glock handgun and a small-caliber handgun, and was still on the stage when he turned one of the guns on himself. The small-caliber handgun had not yet been recovered, he said.
The gunman started shooting with a shotgun, then switched to a handgun, said Grady.