In Beverly Hills, thousands of President Donald Trump's supporters rallied on Saturday afternoon, waving American flags and signs showing support for the Republican president.
At around 2.30pm, video from the scene shows black-clad Antifa supporters attacking a member in the "USA Freedom Rally". At first, a Trump supporter is seen fighting with a black-clad counter-protester who is trying to steal away his American flag after fervent verbal arguments.
Seconds after the Trump supporter throws an elbow at the attacker, at least six other apparent Antifa supporters cluster at the pro-Trump advocate, beating him with fists and a lead pipe.
At the sound of a police siren, the attackers scattered and fled into the crowd. The Trump supporter was seen chasing one of the assaulters and swinging at his back with a wooden flag pole.
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Moments later, police declared the rally an illicit assembly and ordered the crowd to scatter.
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Protesters cleared the junction but the pro-Trump rally proceeded with a march through Beverly Hills.
The pro-Trump protester had injuries to his face and was treated by the Beverly Hills Fire Department, a police official said.
Antifa, short for "anti-fascist", is a radical left-wing movement that seeks to confront those whom it considers racist or authoritarian. Its supporters are known for dressing in all-black, and being unabashed by physical violence.
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Antifa is known for its aggressiveness, and many felt unsafe leaving their homes when it performed riots all around the country.
The surprising scene in Beverly Hills drew a strong reaction from actor James Wood, an outspoken Trump supporter, who called for "militias" to respond.
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"This is an American patriot being brutally beaten by armed DEMOCRAT-supported Antifa scum," Woods wrote in a tweet.
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"Where are our militias? If you can't carry an American flag in Beverly Hills without being assaulted by armed Democrat mobs, we need to arm ourselves," the actor continued.
Like other departments across the nation, the Beverly Hill Police Department was already on great alert in expectation of civil unrest.
"Beginning on Halloween and through Election week, the Beverly Hills Police Department (BHPD) will be on full alert throughout the residential and business districts," BHPD said in a statement earlier this week. "Additionally, other law enforcement personnel and private security companies will offer support and coordinate closely with BHPD."
On Friday and Saturday, many of the luxury retailers and other businesses in Beverly Hills began to cover their windows.
Iconic Rodeo Drive will be closed to both vehicles and walkers starting on Election Day in a bid to prevent widespread looting.
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