One person was killed in a collision involving a motorcycle and a vehicle on the westbound 91 Freeway in Corona Saturday.
The crash was reported shortly before 8:30 a.m. Saturday, according to the California Highway Patrol.
Witnesses told authorities the rider was seen swerving and/or tailgating prior to the collision for unknown reasons.
The crash caused several blocked lanes shortly after 10:30 a.m., but they were reopened roughly 15 minutes after, according to a CHP incident log.
It was not immediately clear what triggered the collision or which party was pronounced dead.
The cause of the collision was under investigation.