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Fourth of July descended into mayhem across Southern California as unruly crowds overwhelmed packed-out fireworks displays, looted stores, ignited fires and saw cops charge on horseback.

The worst unrest erupted in Newport Beach, where Independence Day revelers poured into Orange County, choking traffic and triggering a police response as disorder spread near the pier.

Authorities ultimately shut down businesses from the Newport Pier to Pacific Coast Highway as officers moved in to restore order.

8 The worst unrest erupted in Newport Beach, where unruly crowds saw cops charge on horseback. Instagram/@herbertgcalderon

8 Mounted officers rode horses into revellers to clear the area so additional arrests could be made. Instagram/@herbertgcalderon

8 Officers were swarmed by hundreds of people who hurled bottles and other debris at them. Instagram/@herbertgcalderon

Officers were swarmed by hundreds of people who hurled bottles and other debris at them before the crowd turned on one another and began fighting.

Mounted officers rode horses into them to clear the area so additional arrests could be made.

Video from the scene also appeared to show the aftermath of the reported looting of a Pavilions grocery store in Newport Beach, with merchandise strewn across the parking lot while groups of people lingered outside the business, laughing and joking.

8 Police in riot gear line a crosswalk in Newport Beach. Obtained by the CA Post

8 Multiple people were injured after a serious fireworks accident in Chino, CA. Courtesy of Gabriel Gilmore

8 Another video showed the aftermath of a reported looting of a Pavilions grocery store in Newport Beach. X/@sarahhoak

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It also appeared that many of those involved in the unrest wer

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