A teen who was riding his bike without a helmet was struck by a vehicle in Chula Vista Wednesday, leaving him with serious head injuries.
Chula Vista police say the vehicle was traveling south on Third Avenue when the driver struck a 16-year-old cyclist at the Orange Avenue intersection at 6:10 p.m.
The cyclist was taken to the hospital for serious injuries.
The driver was not injured, but a 10-year-old boy in the passenger seat suffered minor wounds and cuts when the windshield shattered. The child was also taken to the hospital, according to police.
An infant in the back seat was not hurt.
Investigators say the teen was riding a "fixie" bike, a fixed-gear bicycle that apparently does not have brakes.
Officers would not say if that played a role in the accident.
Police have closed southbound Third Avenue between Quintard and Orange as they investigate. Traffic may be impacted for the next few hours.