A five-vehicle crash slowed traffic Tuesday morning on the westbound Riverside (91) Freeway in Yorba Linda and injuries were reported.
The crash was reported near the exit to the 241 Toll Road about 1 a.m. with three vehicles involved, according to the California Highway Patrol.
Moments later, two more vehicles crashed into the three vehicles that were already stopped, the CHP said.
The CHP reported injuries from the crash, but did not release further details.
One of the motorists involved may have fled the scene of the crash southbound on the 241 Toll Road, the CHP said.
Paramedics were blocking the slow lane of the freeway and all other vehicles involved in the crash were moved to the right shoulder of the freeway about 1:25 a.m.