Up to four vehicles were involved in a collision tonight on the westbound Pomona (60) Freeway, prompting lane closures in the Diamond Bar area.
Two left lanes, including the carpool lane, were closed during the investigation, California Highway Patrol Officer Tatiana Sauquillo said.
The multiple-vehicle collision was reported at 7:27 p.m., Sauquillo said.
"It was three to four vehicles involved," Sauquillo said. "Injuries are unknown at this time."