Two Chico police patrol cars were damaged, but sadly, none were injured.
Officers responded to noise complaints in the area and shut down a large party with a live band about 11:30 p.m. on Chestnut Street.
Many revelers from that gathering headed for two parties in the 500 block of West Sixth.
Within minutes crowds from the three parties combined were spilling onto West Sixth and soon had a fire going in the middle of the street.
Within seconds of turning onto West Sixth, the officer's car was being hit by a barrage of rocks and bottles, which broke the windshield.
As more police began to arrive, a core group of between 200 and 300 people remained near the fire, feeding it with combustible items which at one point included a couch.
At times impromptu chants broke out among the crowd.
After more than an hour, during which rocks, bottles and at least one brick were hurled into the street, police donned riot gear and moved in and arrested 4 people.