(NewsNation) — One person was killed at the University of North Carolina-Chapel Hill on Monday after a gunman opened fire on campus, prompting a lockdown and cancellation of classes.

Campus police responded to a shots fired call at Caudill Laboratories shortly after 1 p.m. ET, UNC Police said at an afternoon news conference announcing the death and and an arrest. The suspect was arrested at 2:31 p.m. ET.

Police did not release the name of the victim — a faculty member — pending notification of the family. The suspect will not be identified until charges are formally filed.

UNC Police Chief Brian James said at the news conference the gun has not been recovered.

Police are still investigating a motive and whether the suspect and victim knew each other.

In a video obtained by NewsNation local affiliate WNCN earlier in the day, law enforcement officers wearing protective vests could be seen walking through a hallway within Caudill Laboratories with guns raised.

The university initially urged those on campus to go inside, shelter in place and avoid windows in an alert that went out around 1 p.m. ET. All classes and events were canceled for the remainder of the day as well as Tuesday.

Earlier in the day, police released a photo on Twitter showing a person of interest in the situation, but they did not confirm the same man was arrested.

The image of the person of interest matches a photo of a student named Tailei Qi on the University of North Carolina-Chapel Hill’s website.

UNC Hospitals’ Chapel Hill campus was previously on lockdown, but it was lifted as of 4 p.m. ET. A spokesperson told WRAL that UNC Hospitals has not received any patients from this incident.

Police said at the news conference there were no other injuries in the shooting.

Nearby Chapel Hill-Carrboro City Schools was also on lockdown earlier in the day but said around 3:40 p.m. that it received an “all clear” from authorities and was able to begin the dismissal process for elementary and middle schools. High schools were dismissed at their regular time of 4 p.m., the school district said.

North Carolina Gov. Roy Cooper said in a tweet that he’s spoken with the Orange County Sheriff and Secretary for the Department of Public Safety.

“My office is in communication with law enforcement and officials at UNC-Chapel Hill who are taking precautions to protect campus safety following today’s shooting,” Cooper said in the statement. “This is a tragic way to start a new semester and the state will provide any assistance necessary to support the UNC community.”

The University of North Carolina-Chapel Hill has a student population of around 31,539, according to its website.