The FBI is responding to a reported barricade situation inside the U.S. Army’s Fort Belvoir in Virginia on Sunday.

The FBI’s National Capital Response Squad based out of the Washington field office has responded to the scene, along with a military SWAT team and military police, according to a report from WUSA9. The nature of the barricade incident remains unclear and authorities have not released details on how many people may be involved.

“The situation is ongoing, and we cannot comment further at this time,” the FBI told the outlet.

This is a developing story. Check back soon for updates.

The FBI and military police are responding to a reported barricade situation in Fort Belvoir, Virginia, a military base. The FBI has not released details on the incident.