At least three people were killed and at least five others were injured at Michigan State University after shootings at two locations on the East Lansing campus Monday night, university police said.

Students were urged to "secure in place" as officials searched for a shooter who remained at large hours after gunfire was first reported at 8:18 p.m. local time, according to NBC News.

Five victims were transported to E.W. Sparrow Hospital in Lansing, and some of the injuries were life-threatening, Interim Deputy Chief Chris Rozman said late Monday.

The university said the first shots were fired inside Berkey Hall at 8:18 p.m. on the north end of campus near Grand River and Farm Lane, the Detroit News reported.

Gunshots reportedly were later heard at nearby Snyder-Phillips Hall, where police began swarming the building with guns drawn. IM East was investigated by police afterward, according to MSU police.

MSU spokeswoman Emily Guerrant confirmed one fatality from the shooting inside Berkey Hall, which houses the College of Social Science, the Institute for Public Policy and Social Research and the Department of Sociology, according to MSU's website.

Before 10:00 p.m., MSU police said the suspect is believed to be a short male with a mask: "Please continue to shelter in place. We are still receiving multiple calls of an active shooter on campus."

Police have said they believe there is only one suspect at this time. As of 10:54 p.m., the searches for the suspect were still continuing.