A gunman is dead and two people are hurt after a shooting at Old Dominion University on Thursday morning, the Virginia school said.

ODU said a gunman opened fire in its business school building, injuring two people who were sent to the hospital. It wasn’t immediately clear how the shooter died.

READ MORE: Georgia high school shooting suspect’s father convicted of second-degree murder, involuntary manslaughter

The two people injured are in critical condition, said a spokesperson for Sentera Health, the health care system that oversees the hospital.

Within about an hour of the shooting, ODU declared that there was no longer a threat on the campus.

The public university in Norfolk canceled classes and suspended all operations on its main campus for the rest of Thursday and urged people to avoid the area in and around Constant Hall while emergency officials continued to work.

In a message to the university community, ODU President Brian Hemphill said the school faced a tragedy on campus. He expressed gratefulness for the swift emergency response and thoughts and prayers to those impacted.

“The safety of our campus community is my top priority,” Hemphill wrote. “We are deeply committed to safeguarding all Monarchs and ensuring a secure learning, living, and working environment at all times.”

The federal Bureau of Alcohol, Tobacco, Firearms and Explosives said on the social platform X that it had agents on scene supporting the response.

Virginia Gov. Abigail Spanberger said in social media posts that she was monitoring the situation and that “state support is being mobilized” to help ODU. She didn’t provide specifics.

Located in coastal Norfolk, Old Dominion University has about 24,000 students, 17,500 of them undergraduates. The school has around 240 degree programs, and is known for its research spending and doctoral programs. Nearly 30% of its students are military-affiliated, according to the university website. The area is also home to Naval Station Norfolk, the largest naval station in the world.

Associated Press journalist Allen G. Breed in Wake Forest, North Carolina, contributed to this report.