A motorcyclist was killed in a collision Saturday in Diamond Bar, authorities said.
Officers responded at 2:46 a.m. to the northbound Orange (57) Freeway just south of Diamond Bar Boulevard, the California Highway Patrol reported.
The motorcyclist was pronounced dead at the scene
The crash closed three lanes of the freeway for several hours.
No further information regarding the collision was available, the CHP said.
The cause of the collision is under investigation.