Delaware State University lifted its campus-wide lockdown Monday, hours after a male student was shot and wounded at an off-campus residence hall, the school said on Twitter. Police in Dover, Delaware, determined that the shooting was an isolated event and declared that it was safe for university students to leave their dorms, the Associated Press reports.

“The DSU campus lockdown has been lifted. Students are free to leave their residence halls on campus; still urged to exercise caution,” the university tweeted Monday night.

The unnamed victim was taken to Kent General hospital and treated for non-life-threatening injuries, NBC 10 Philadelphia reports. The gunman remains at large and neither police nor school officials have revealed his identity or provided a description.

The shooting took place at around 5 p.m. ET at Delaware State’s Living and Learning Commons, an off-campus residence hall converted last year from a Sheraton hotel. The building is about a half-mile away from the university’s campus in Dover, the AP notes. A campus-wide lockdown was instituted at around 5:30 p.m. ET and lifted shortly after 8 p.m. ET.

While the shooter has yet to be caught, authorities have not declared an active shooter situation, Reuters reports. The attack “appears to be an isolated incident,” Dover Police Cpl. Mark Hoffman said, according to the Los Angeles Times. Delaware State University police will conduct the subsequent investigation with help from the Dover Police Department.

The majority of Delaware State University’s 4,100 students live on campus, the AP notes. In 2007, two freshmen were shot on campus, while a third freshman was charged in connection with the crime. One of the shooting’s victims later died from her injuries.