Several people were injured Monday night at Michigan State University, police said.

University police said on Twitter that there appears to be only one suspect, described as a “short man wearing a mask,” and that he is still at large.

“We continue to receive several calls about an active shooter on campus,” police said.

At least five victims were at Sparrow Hospital, said hospital spokesman John Foren, who did not have an update on their condition.

Authorities ordered students and staff to shelter in place after gunshots were reported shortly after 8:30 p.m. around Berkey Hall, an academic building, on the East Lansing campus.

The alert advised students and staff to “get in place immediately” and monitor alert.msu.edu for information.

By 10:15 p.m., police said Berkey, as well as nearby dormitories, were secured.

Separately, the police reported about the shooting in the student recreation center of IM Vostok.

Aidan Kelly, a junior who lives half a mile (less than a kilometer) east of campus, said he locked his doors and closed his windows “just in case.” Sirens were constant, he said, and a helicopter hovered overhead.

“It’s all very scary,” Kelly said. “And then all these people are texting me asking if I’m OK, and it’s overwhelming.”

Authorities announced late Monday that all campus activities would be canceled for 48 hours, including athletics and classes. Via Twitter, people were advised not to come to campus on Tuesday.

Michigan State has about 50,000 students. East Lansing is about 90 miles (145 kilometers) northwest of Detroit.

The East Lansing High School auditorium, where a school board meeting was held Monday night, was locked down and police were preventing people from leaving, the Lansing State Journal reported.

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