A growing number of law enforcement agencies across Southern California are on high alert about possible “takeovers” or illegal gatherings after an Orange County coastal city became a target during the Fourth of July weekend.

The Los Angeles County Sheriff’s Department sent a warning message Friday about a potential gathering in Lakewood while the Los Angeles Police Department pledged zero tolerance for illegal activities at Dockweiler State Beach.

The Sheriff’s Department said someone or a group is “promoting” a weekend event via social media without the city’s authorization, adding it will “not tolerate criminal activity disguised as a celebration.”

“Events like these have led to violence, vandalism, assaults, thefts and reckless driving and other crimes in surrounding communities,” the sheriff’s department said in a statement, promising to deploy additional deputies and investigative resources to protect neighbors and businesses in the area.

The LAPD, meanwhile, was preparing for illegal gatherings over the weekend in the Playa del Rey area, especially around Dockweiler Beach.

While social media posts promote beach takeovers and bonfires at the popular state park, there will be “zero tolerance” for anyone breaking the law during unpermitted parties, Cpt. Eric Eppolito of the LAPD told NBCLA.

With the World Cup Fan Zone being in Venice Beach, not too far from Dockweiler, LAPD officers will be vigilent about maintaining public security, Eppolito said.

Friday’s warnings came as the city of Huntington Beach pledged to crack down on “takeovers” and arrest those who gather illegally for any criminal activity, such as vandalism, rioting, assault and theft.

Another Orange County city, Newport Beach, arrested over 400 people after chaos erupted during the Fourth of July weekend, with most of the arrested coming from the different regions, including Arizona and Nevada. Police said the unruly crowded blocked roads, drank in public and committed vandalism after a takeover was promoted on social media.

Authorities in Lakewood, Huntington Beach and Dockweiler State Beach all warned they will enforce the law against anyone who organizes, promotes and participates in unpermitted events. If people under 18 break the law, their parents or guardians could be help financial responsible for damages.