Updated

A gunman opened fire inside an academic hall on Michigan State University's campus on Monday evening, leaving three people dead and five others wounded, according to police. 

The suspect was later found dead from a self-inflicted gunshot wound off of MSU's campus, Deputy Chief Chris Rozman said shortly after midnight. 

"This truly has been a nightmare that we are living tonight, but we have remained laser-focused on the safety of our campus, our students, and our surrounding community," Rozman said. 

All five wounded victims, some of whom have life-threatening injuries, were transported to Sparrow Hospital for treatment. 

The shooting started at 8:18 p.m. inside Berkey Hall, which is home to MSU's Department of Sociology on the northern boundary of campus. 

MICHIGAN STATE STUDENTS HID IN LAUNDRY AND ON CAMPUS: ‘WE’VE ALWAYS BEEN PREPARING FOR A MASS SHOOTING'

The school sent out a shelter-in-place order at 8:31 p.m., telling students to stay inside and barricade themselves. 

"Run, Hide, Fight," MSU said in the alert. "Run means evacuate away from danger if you can do so safely, Hide means to secure-in-place, and Fight means protect yourself if no other option."

After firing rounds inside Berkey Hall, the suspect walked to MSU Union and opened fire again, according to police. 

MSU canceled classes for the next two days and urged students not to come to campus on Tuesday. 

Hundreds of law enforcement officers from the FBI, ATF, Michigan State Police, and other agencies assisted local authorities in securing the campus. The FAA implemented temporary flight restrictions over MSU's campus through Wednesday. 

Investigators are still working to confirm the identity of the suspect. It wasn't immediately clear if he had any affiliation with the university. 

Ben Finkelstein, a senior at MSU, said that he was hiding under his bed after hearing two faint shots earlier in the evening. 

"I've never been more afraid than I am now," Finkelstein told Fox News Digital. "I'm shaking."

LAS VEGAS SUSPECT NABBED IN HOOKAH LOUNGE SHOOTING RAMPAGE; ONE VICTIM DEAD

Another student who is also a senior at MSU said she is physically ok but "absolutely terrified."

"I have been physically and mentally preparing for a mass shooting since elementary school," the student told Fox News Digital. "Honestly it just doesn’t feel real."

Michigan Gov. Gretchen Whitmer said that she's been briefed by Michigan State Police about the shooting. 

"Let’s wrap our arms around the Spartan community tonight," Whitmer tweeted. Sen. Debbie Stabenow also tweeted that she was tracking the shooting. 

CLICK HERE TO GET THE FOX NEWS APP

Michigan State University has an enrollment of more than 50,000 students and is located in East Lansing. 

Fox News' Adam Sabes and Chris Eberhart contributed to this report.