The New York Police Department has activated its Joint Operations Center in coordination with FBI, state, local and federal partners ahead of what is expected to be widespread protests Saturday across the city.

Some 34,000 members of the NYPD will be on the streets of New York City over the next 24 hours.

"You do not have a right to engage in violence and lawlessness," Mayor Eric Adams said in a news conference yesterday ahead of the planned protests.

United States Army North confirmed to ABC News that Marines at the Wilshire Federal Building have made the first temporary detention among the troops sent to Los Angeles on Friday.

In an interview earlier in the week, Maj. Gen. Scott Sherman -- the commander of Joint Task Force 51 -- said, "We're there to protect their federal officers, their federal personnel.”

If those personnel are assaulted, Sherman said, "Soldiers or Marines are allowed to take that person, detain them in place, wait for the federal law enforcement officer to come and arrest that individual."

It was not immediately clear what led to the detainment on Friday.

-ABC News' Luis Martinez

About 200 Marines are taking over responsibility for protecting the Wilshire Federal Building in Los Angeles, Maj. Gen. Scott Sherman told reporters Friday.

The addition of those troops will allow more National Guardsmen to be trained to accompany federal personnel during Immigration and Customs Enforcement raids, according to Sherman.

“The soldiers that were performing those duties will then transition to providing protection to federal law enforcement officers as they conduct their law enforcement function,” Sherman said. “I would like to emphasize that the soldiers will not participate in law enforcement activities. Rather, they'll be focused on protecting federal law enforcement personnel."

Sherman serves as the commander of Joint Task Force 51, the command headquarters for the 4,000 federalized National Guardsmen and 700 Marines assigned to protect federal personnel and property in Los Angeles.

In an interview with ABC and the Associated Press earlier this week, Sherman said, as of then, about 500 of the 4,000 National Guardsmen assigned to the LA area had been specifically trained to work with ICE teams.

-ABC News' Luis Martinez

Marines are now on duty in Los Angeles for the first time. Some were spotted guarding the Wilshire Federal Building on Friday.

Sen. Alex Padilla, D-Calif., was physically removed from the room by federal officers when he tried to interrupt Homeland Security Secretary Kristi Noem's news conference in Los Angeles.

Before being pushed out of the room, he said, "The fact of the matter is half a dozen violent criminals that you’re rotating on your, on your -- hands off.”

Padilla told reporters that he's been pushing for more information on the administration's immigration enforcement actions and he went to the news conference "to hear what she had to say and see if I could learn any new additional information."

After Padilla tried to ask a question, he said he was forced out of the room, forced to the ground and handcuffed.

Padilla stressed that he was not detained and not arrested.

"If this is how this administration responds to a senator with a question ... you can only imagine what they're doing to farmworkers, to cooks, to day laborers," the senator told reporters, overcome with emotion. "We will hold this administration accountable."

Tricia McLaughlin, assistant secretary for public affairs at DHS, claimed the senator "interrupted a live press conference without identifying himself or having his Senate security pin on as he lunged toward Secretary Noem."

"Mr. Padilla was told repeatedly to back away and did not comply with officers’ repeated commands," she said. "@SecretService thought he was an attacker and officers acted appropriately." McLaughlin described Padilla's actions as "disrespectful political theatre."

Noem said, "I think everybody in America would agree that that wasn't appropriate -- that if you wanted to have a civil discussion, especially as a leader, a public official, that you would reach out and try to have a conversation."

Noem and Padilla met for 15 minutes following the incident, she said.

California Gov. Gavin Newsom, LA Mayor Karen Bass and other Democrats have expressed their outrage.

"Senator Alex Padilla is one of the most decent people I know," Newsom said. "This is outrageous, dictatorial, and shameful. Trump and his shock troops are out of control."

"What just happened to @SenAlexPadilla is absolutely abhorrent and outrageous," Bass said. "This administration’s violent attacks on our city must end."

The Congressional Hispanic Caucus is demanding an investigation.

-ABC News’ Alex Stone, Luke Barr and Jenna Harrison