SAN MARCOS (CNS) - A 47-year-old man on a bicycle was struck and seriously injured by a hit-and-run driver in San Marcos early Sunday, a sheriff's deputy said.

The bicyclist was headed west in the bike lane in the 1000 block of East Mission Road west of Avenida Chapala about 12:30 a.m. when an unknown westbound vehicle crossed into his lane and struck him from behind, sheriff's Deputy Frank Stalzer said.

The rider went over the bike's handlebars and his face struck the roadway and curb, which caused major facial injuries, Stalzer said.

The driver then sped away, westbound on East Mission Road, Stalzer said.

Fire personnel took the injured bicyclist to Palomar Medical Center to be treated for serious injuries, Stalzer said.

Stalzer asked anyone with information on the hit-and-run crash to call the San Diego County Sheriff's Department's non-emergency line at (858) 565-5200, or Crime Stoppers at (888) 580-8477.