Three people were killed and three others were injured during gunfire in Spotsylvania County, Virginia, about 60 miles south of Washington, D.C., a sheriff said Tuesday night.

Spotsylvania Sheriff Roger L. Harris said in a Wednesday Facebook statement that "all suspects are in custody and there is no threat to public safety." The suspects have not been identified, and the sheriff's office will release a press release on Wednesday.

Police were still hunting the suspects overnight, and at a Tuesday night news conference, Maj. Elizabeth Scott of the Spotsylvania Sheriff’s Office told people to stay clear of the area.

Residents near the shooting should stay indoors, she added.

Public schools in nearby Fredericksburg are scheduled to open two hours behind schedule Wednesday to allow for preparations that will enable staff to provide "care and support ... during this difficult time," the city school district said in a statement.

Scott said it wasn't clear if two or three people who were seen being questioned were suspects.

"This is about as bad as it can get with six people shot right now," Scott said.

The victims were hospitalized in unknown condition, and their ages were unavailable, Harris said in a statement.

"Upon arrival, deputies found multiple subjects shot," he said. "No suspect(s) have been apprehended at this time."

The violence was reported about 5:30 p.m. in the area of Old Greenwich Circle in Spotsylvania County, Harris said. That's about 56 miles south of Washington.

Scott said investigators at the scene, Virginia State Police, and nearby Fredericksburg police were trying to determine what happened.

"Multiple investigators are still there trying to determine who the suspects were and what the motive is," she said.