Officers are appealing for witnesses following a serious road traffic incident, which took place on Boxing Day.
At 10.10pm a 56-year-old man was crossing Cotswold Avenue, between Mendip Road and Newton Road in Duston, Northampton, near to a bus stop, when he was struck by an unknown vehicle that failed to stop.
The man was taken to Northampton General Hospital with serious injuries.
There is currently no description of the vehicle involved in the collision.
Anyone who witnessed the incident or anyone with any information that may help identify the vehicle and driver involved in the collision, is asked to contact the Collision Investigation Team on 101 or call the Drivewatch Hotline on 0800 174615.