The other six were hospitalized with non-life-threatening injuries, and included the driver and passenger, police said. .
After Arlington County Fire Department crews extinguished the blaze, engineers determined that the building was "structurally sound, but could not be reoccupied," the fire department saidThe cause of the crash remains under "active investigation" as "detectives continue to review evidence and speak with witnesses to determine the events that preceded the crash," police disclosed Saturday