A 55-year-old woman was seriously injured Thursday night when she was struck by a hit-and-run driver as she walked across a road in the Ashburn area, Loudoun County Sheriff’s Office officials said.

The woman, who was not immediately identified, was hit as she tried to cross Gloucester Parkway, near Ashby Ponds Boulevard, about 7:20 p.m. Sheriff’s investigators think she was struck by a small, dark-colored four-door passenger car.

The woman was flown to Inova Fairfax Hospital with serious injuries.

Police believe the car probably has damage to the front-end passenger side and the under-carriage.

Anyone with any knowledge of the incident was asked to contact the Loudoun County Sheriff’s Office at 703-777-1021.