A pursuit ended in a six-car pileup in Rancho Cucamonga, and three people were slightly injured.
Authorities say seven people have been injured in a 10-car pileup on a major thoroughfare in Hawthorne.
A pileup involving three big rigs and five vehicles snarled traffic on Interstate 10 in the Banning area Friday, but no serious injuries were reported.
The collision caused traffic to back up on the 5 Freeway, along with the northbound 170 Freeway and a small segment of the 118 Freeway.
One person was killed in an eight-car pileup near a Fullerton intersection Thursday.
Authorities have identified three people who were killed Saturday in a 10-car crash in Newport Beach.