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, six of them fatally, then shot and killed himself, said university President John Peters. "A lot of people were screaming. Everybody started running for the door," said student Zach Seward. "It was just complete chaos."Four died at the scene, including the shooter, and three later died at a hospital, officials said.
At least 22 people, including the gunman and a graduate student who was teaching an ocean sciences class, were shot, Peters said.
Late Thursday, dozens of students gathered on campus for a candlelight prayer vigil. Video footage showed students comforting one another and a young man playing guitar.
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