Perp's name is reported to be 'Wossen Assaye.' Foto at right.
WTOP said the shooting occurred at 3 a.m. at the hospital in Falls Church. It's not clear if anyone was hurt, but shots were fired, CBS reported.
Fairfax County Police said they are searching for an escaped prisoner wearing a hospital gown, no shoes and armed with a gun. Police said the prisoner, Wossen Assaye, is 6-foot-tall and 170 pounds, and is considered "armed and dangerous."
The prisoner was in the custody of a private security guard and escaped with the guard's gun, Fairfax County Police said.
Entrances to the hospital and nearby intersections to the hospital at 3300 Gallows Road are blocked. All hospital employees are directed by police to go to Falls Church High School where a shuttle bus will take them to the hospital. The hospital still remains on lockdown.