vehicles plus the horse trailer were involved in the crash, which began when the vehicle towing the trailer struck a guardrail.

A driver struck a horse early Sunday on the 15 Freeway in Norco, according to a Riverside County fire official. It was unclear how the horse got onto the freeway.

The crash happened a little before 2 a.m. on the northbound 15 Freeway, according to the California Highway Patrol.

A person and a horse died after a car collided with the animal on the 15 freeway in Norco on Sunday, authorities said. Around 2 a.m., a sedan was traveling along the freeway, near Sixth Street, when the driver collided with the horse, according to the Cal Fire Riverside County Fire Department.

One person and a horse are dead after a car struck a horse on the 15 Freeway in Norco overnight. The California Highway Patrol said it received several calls before 2 a.m. Sunday of a horse running around the northbound lanes of the 15 Freeway.