(BALTIMORE) — Four students were among five people shot at Baltimore’s Morgan State University Tuesday night, prompting a shelter-in-place order at the school, police said.

The victims — four men and one woman, between 18 and 22 years old — all suffered non-life-threatening injuries, authorities said.

The gunfire broke out “on campus within the vicinity of the Murphy Fine Arts Center and Thurgood Marshall Hall,” according to university President David Wilson.

Christian Gatlin, a 20-year-old junior, was on the second floor of the student center when he heard what he thought was fireworks, but now assumes was a “faint gunshot.”

“We just saw people running,” Gatlin told ABC News. “It was just chaotic.”

“Everybody just starting screaming and alerting people next to them that there was an active shooter and to brace ourselves,” student Shawn Pollard said.

Freshman Anaiah Pamplin said she was sitting in the cafeteria when she heard four pops.

“It didn’t really register at first until I saw people duck and run. Then I ran to the back of the cafeteria,” she said. “I was just in shock.”

Just before midnight, police said on social media that the incident was no longer being considered an active shooter situation. Half an hour later, Morgan State University said the shelter-in-place order on campus had been lifted.

“They cleared every single floor twice,” Baltimore Police Department Commissioner Richard Worley said at a news conference. “After that, when we realized the campus is most likely safe, and we opened it back up because the shooter was nowhere around that we could find.”

Freshman James Fitzgerald was doing math homework in his dorm when the school went on lockdown.

“When the SWAT [officers] came at my door, you don’t know if that was the shooter or not. So when I saw the flashlight, that really scared me,” he said. “I just prayed.”

“It was terrifying because I’m away from home,” student Irmani-Maure Beauvais said.

A suspect has not yet been identified.

Baltimore Mayor Brandon Scott said, “The entire city of Baltimore’s heart aches for the Morgan community, for these victims and their families and for our city as a whole.”

He called for “national action, especially from Congress.”

Morgan State said classes are canceled Wednesday out of an abundance of caution.

This week is Morgan State’s Homecoming. Wilson said he had just left the coronation of Mr. & Ms. Morgan State University when he learned of the shooting.

“I am convening a meeting with my Executive Cabinet this morning to rethink the rest of Homecoming activities this week and will inform the university community of our decision later this afternoon,” he said in a letter to the school community on Wednesday.

“Our prayers are with our students who suffered injuries, and their loved ones. For those students in need of assistance, our dedicated staff from the Division of Student Affairs and the University Counseling Center are available to provide support,” he added.

ABC News’ Emily Shapiro, Lauren Minore and Chris Boccia contributed to this report.

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