6 shot dead, including gunman, at Northern Illinois University

DEKALB, Illinois (CNN) -- A gunman dressed in black stepped from behind a curtain at the front of a large lecture hall at Northern Illinois University on Thursday and shot 21 people, five of them fatally, then turned shot and killed himself, said university president John Peters.

Four died at the scene, including the shooter, and two later died at the hospital, he said.

At least 22 people, including a graduate student who was teaching an ocean sciences class, were shot, Peters said.

Seventeen victims were taken to Kishwaukee Community Hospital, its Web site said.

Of those, six were in critical condition and were flown to other hospitals. One fatality, a male, was confirmed -- but was not the gunman, the hospital said. Two were admitted, and three others were discharged. The other five were not addressed on the Web site.

Four of the fatalities were female, said Peters.

Most of the injuries are head and chest gunshot wounds, a hospital spokeswoman told CNN.

The gunman started shooting from a stage in the room shortly after 3 p.m. (4 p.m. ET) in Cole Hall, officials said.