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.

Los Angeles District Attorney Nathan Hochman announced during a press conference on Wednesday that there have been at least five criminal cases stemming from the ongoing immigration protests in Los Angeles.

Juan Rodriguez, from Gardena, California, was charged with one felony count of assault upon a peace officer, resisting arrest and advocating violence against an officer that has caused injury. He faces six years and four months in state prison, according to the DA. Rodriguez is accused of distributing and throwing commercial-grade fireworks at police officers on June 8.

Randy Ruiz and Georgina Ravallaro were charged with two felony counts of assault upon a peace officer and face six years and four months in state prison. They are accused of driving motorcycles into police officers, injuring one and knocking down several others.

Timmy Paulk and Raven Mitchell have been charged with one felony count of second-degree commercial burglary and grand theft for allegedly robbing and facilitating the robbery of a Nike store on June 8. Paul is accused of stealing multiple items from that store and getting into the car driven by Mitchell. They each face up to three years in state prison.

Ulysses Sanchez is accused of recklessly driving a minivan in downtown LA on June 8. He's charged with one felony count of assault with a deadly weapon, possession of a firearm by a felon, one misdemeanor count each of reckless driving and possession of a smoking device. He faces 25 years to life because of the three-strike rule.

Christopher Gonzalez and Jocelyn Johnson have been charged with one felony count of conspiracy to commit vandalism and two felony counts of vandalism. They face three years and eight months in state prison. They are accused of vandalizing an apartment complex and the Hall of Justice, respectively.

"If people want to engage in crimes, we will prosecute them," Hochman said, adding, "hurling bricks, hurling cinder blocks, hurling fireworks, will not be tolerated in this county now or ever."

The DA did note that peaceful protests have largely outweighed instances of violence. "We estimate that there's probably thousands of people who've engaged in legitimate protests," Hochman said.

-ABC News' Jenna Harrison Esseling