Two Virginia state troopers were among six people wounded in a shooting at a Richmond Greyhound bus station, local media report.
The suspect and one of the troopers were in critical condition.
State police were holding a training exercise at the time the shots rang out, one trooper's injuries are life threatening.
Witnesses reported hearing as many as 10 shots.
The bus station is three miles north of Virginia Commonwealth University's downtown Richmond campus, and across the street from The Diamond, the city's minor league baseball stadium. Paramedics rushed the wounded to VCU Medical Center.