An alert was issued warning others to stay away from campus until the all-clear was given.
WSOC-TV reported that the shooter was a student at the university.
"He just started shooting during our final presentations and we all ran out", Field wrote on Twitter.
Police are crediting the officers whose quick response nearly certainly saved more lives.
The campus remained on lockdown for hours as a familiar scene replayed at the latest shooting in the United States. He said a fourth person's injuries were less serious.
Terrell was familiar with the classroom building where the attack occurred but it was unclear if he knew the students targeted, Putney said.
Baker added CMPD and the Charlotte Fire Department were on the scene and ready to assist nearly immediately.
Monifa Drayton, an adjunct professor, was walking onto campus when she heard the shots.
Charlotte Mayor Vi Lyles said she was "in shock" after hearing of the rampage. "My students are so special to me and I am devastated". So safe. I've never felt unsafe on our campus.
His grandfather, Paul Rold of Arlington, Texas, says Terrell had moved to Charlotte two years ago with his father.
'You're describing someone foreign to me, ' Rold told the Associated Press on Tuesday night. "This is not in his DNA".
The campus has about 30,000 students and 5,000 faculty and staff, officials said. The campus is located northeast of the city center and is surrounded by residential areas. Secure yourself immediately, " the university said in an alert, referring to the school's Kennedy building on campus. She went to a staging area, she said, to provide support.
Witnesses said a gunman opened fire in a room inside UNCC's Kennedy Hall.
"I am disheartened that I have had to reach out to you regarding so many senseless acts of violence lately, and tonight's events are an unfortunate reminder that bad things can happen at any time and in any place", Guskiewicz said.
Jennifer Bailey, a mum of a grad student at the university, told USA media her daughter was barricaded in an office with 11 other students.
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