Updated: 9:40 p.m.: An eight-year-old boy was killed Sunday when he and his mother were struck by a car that ran off an Alexandria road.

The boy was hit about 2:28 p.m. on Duke Street when a 22-year-old Fairfax County man driving a 1994 Honda Accord veered off the street near the Interstate 395 overpass. Alexandria police said it was not clear why he drove off the road.