It is believed they got loose from a slaughterhouse in the area.
At least 34 cows were seen trotting down Durfee Avenue and other streets, first running in the roadway then cutting through yards and trampling bushes. The Los Angeles County Sheriff's Department reported at about 8:35 p.m. that several cows were in the area.
One cow was shot and killed by a deputy during the incident after the animal injured a person.
Herd of cows loose on streets of Pico Rivera
Pico Rivera City Manager Steve Carmona said it appeared the cow was making a move to run over a baby.
LASD deputies were called to the area to help round up the wandering herd. The department was advising people to steer clear of the area.
The cows were eventually corralled in a cul-de-sac. AIR7 HD captured at least 20 cows on one driveway.
Cows on the loose in Pico Rivera
By 10:20 p.m., authorities said most of the cows had been corralled into trailers.
Authorities late into the night were trying to corral the remaining cows still loose. It is unknown how the cows escaped and started running away.