By Karina Tsui, CNN

(CNN) — Protests against immigration raids in downtown Los Angeles Friday intensified into the evening – prompting authorities in riot gear to deploy tear gas and flash bangs to disperse crowds.

Police on Friday night issued a citywide tactical alert nearly two hours after declaring protests across the downtown area unlawful assemblies. “The use of less lethal munitions has been authorized by the Incident Commander,” LAPD’s Central Division wrote in a post on X.

The protest came after at least 44 people were arrested by federal immigration agents earlier in the day, the Associated Press reported, after Immigration and Customs Enforcement officers executed search warrants at three locations, according to a spokesperson for Homeland Security Investigations.

CNN has reached out to the Department of Homeland Security for further information.

One of the raids that took place on Friday was in the city’s Fashion District, where agents served a search warrant after a judge determined a business was allegedly using fictitious documents for some of its workers, US Attorney’s office spokesperson Ciaran McEvoy told CNN.

David Huerta, the president of the Service Employees International Union California was arrested by federal agents after allegedly attempting to obstruct their access at a worksite, US Attorney for the Central District of California Bill Essayli said in a post on X.

“Let me be clear: I don’t care who you are—if you impede federal agents, you will be arrested and prosecuted,” Essayli said.

After being treated for injuries from his arrest, Huerta released a statement condemning the citywide raids.

“Hard-working people, and members of our family and our community, are being treated like criminals,” he said. “We all collectively have to object to this madness because this is not justice. This is injustice. And we all have to stand on the right side of justice.”

“No one should ever be harmed for witnessing government action,” California Gov. Gavin Newsom said in a statement responding to Huerta’s arrest, describing the union president as a “respected leader, a patriot and an advocate for working people.”

Protesters gathered outside the Federal Building in downtown Los Angeles at roughly 4 p.m., CNN affiliate KABC reported. At one point, hundreds of activists began marching toward a detention facility on Temple Street.

One video obtained by CNN shows protesters retreating from the building’s entrance after coming face-to-face with the police guarding it. Several projectiles are thrown at officers equipped with body armor and protective shields. In response, the police are seen throwing smoke bombs to disperse protesters and pinning at least one person to the ground.

Other videos show the detention center sprayed with graffiti, with some protesters blocking LAPD vehicles close by.

Families and friends who had loved ones taken by immigration authorities visited the detention center to learn more about their status, KABC reported.

A young woman who spoke with the outlet said she went to the building in tears after her father was taken by federal agents.

The LAPD declared an unlawful assembly around 7 p.m. and warned demonstrators were subject to arrest if they remained in the area.

Aerial footage from KABC shows law enforcement throwing smoke bombs on a street to disperse people so they could make way for SUVs and military-style vehicles.

“While the LAPD will continue to have a visible presence in all our communities to ensure public safety, we will not assist or participate in any sort of mass deportations, nor will the LAPD try to determine an individual’s immigration status,” police chief Jim McDonnell said in a statement about the immigration enforcement activities.

“I want everyone, including our immigrant community, to feel safe calling the police in their time of need and know that the LAPD will be there for you without regard to one’s immigration status.”

In a statement released Friday, Los Angeles Mayor Karen Bass slammed immigration enforcement actions as tactics to “sow terror” in the community and “disrupt basic principles of safety.”

“As Mayor of a proud city of immigrants, who contribute to our city in so many ways, I am deeply angered by what has taken place,” she said.

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CNN’s Martin Goillandeau and Sarah Dewberry contributed to this report.