MINNEAPOLIS — Celebrities, musicians and political leaders gathered in front of George Floyd's golden casket Thursday for a fiery memorial service for the man whose death at the hands of police sparked global protests, with a civil rights leader declaring it is time for black people to demand, "Get your knee off our necks!"

The service — the first in a series of memorials set for three cities over six days — unfolded in Minneapolis at a sanctuary at North Central University as a judge a few blocks away set bail at $750,000 each for the three fired police officers charged with aiding and abetting murder in Floyd's death.

"George Floyd's story has been the story of black folks. Because ever since 401 years ago, the reason we could never be who we wanted and dreamed to be is you kept your knee on our neck," the Rev. Al Sharpton said in a fierce eulogy. "It's time for us to stand up in George's name and say, 'Get your knee off our necks!'"

Floyd, a 46-year-old out-of-work bouncer, died May 25 after a white police officer, Derek Chauvin, put his knee on Floyd's neck for several minutes as he lay handcuffed on the pavement, gasping that he couldn't breathe. Chauvin has been charged with murder, and he and the others could get up to 40 years in prison.

From coast to coast, and from Paris and London to Sydney and Rio de Janeiro, the chilling cellphone video of Floyd's slow death has set off turbulent and sometimes violent demonstrations against police brutality, racism and inequality. Some protests continued Thursday.

Those gathered at the Minneapolis tribute stood in silence for  8 minutes, 46 seconds, the amount of time Floyd was alleged to be on the ground under the control of police.

Sharpton vowed that this will become a movement to "change the whole system of justice."

"Time is out for not holding you accountable! Time is out for you making excuses! Time is out for you trying to stall! Time is out for empty words and empty promses! Time is out for you filibustering and trying to stall the arm of justice!" he said.

The service drew the Rev. Jesse Jackson, Sen. Amy Klobuchar and other members of Congress, including Reps. Ilhan Omar, Sheila Jackson Lee and Ayanna Pressley. Among the celebrities in attendance were T.I., Ludacris, Tyrese Gibson, Kevin Hart, Tiffany Haddish and Marsai Martin.

"All these people came to see my brother," Philonise Floyd told the crowd at the memorial in awe as he recounted their childhoods playing catch and eating banana-mayonnaise sandwiches. "That's amazing to me that he touched so many people's hearts because he touched our hearts." He and other family members spoke lovingly of Floyd, who was well over 6 feet tall, which earned him the nickname "Big George."

The casket was covered in red roses, and a vibrant image was projected above the pulpit of a mural of Floyd painted at the street corner where he was arrested by police on suspicion of passing a counterfeit $20 bill at a convenience store. The message on the mural: "I can breathe now."

The sanctuary normally seats 1,000, but because of the coronavirus outbreak, the capacity was reduced to about 500, and many mourners wore masks, some with "I can't breathe" on them.

Outside, hundreds chanted Floyd's name as a hearse prepared to carry him away.

His body goes next to Raeford, North Carolina, near where he was born, for a public viewing and private family service on Saturday. A public viewing will be held Monday in Houston, where he was raised and lived most of his life.

In the U.S., where protests had been marked by bouts of lawlessness since last week, relative quiet prevailed for a third straight night Thursday, a day after prosecutors charged the three other officers at the scene and filed a new, more serious count of murder against Chauvin.

In New York City, a large crowd gathered at Brooklyn's Cadman Plaza and chanted "You are not alone" in a rally with one of George Floyd's brothers 

"I thank God for you all showing love to my brother," said an emotional Terrence Floyd.

Peaceful demonstrations continued past the city's 8 p.m. curfew, even as Gov. Andrew Cuomo and Mayor Bill de Blasio sought to deflect criticism over harsh tactics from police enforcing the curfew the night before. While there was a heavy police presence on the streets, they did not immediately move in to make arrests.

In Buffalo, video from television station WBFO showed an officer appearing to shove a man who walked up to police while they were enforcing a nightly curfew. The man falls backward, hits his head on the pavement and immediately begins bleeding as officers walk past him. A county official tweeted that the man was hospitalized and stable, but his exact condition was not immediately known.

News outlets reported that Buffalo Police Commissioner Byron Lockwood suspended two officers late Thursday.

In Washington, the law enforcement presence was much lighter compared to the previous night, and thousands of people marched peacefully from near the White House to the Lincoln Memorial. Police cleared the largely empty streets of cars just ahead of the demonstrators' path. The protests broke up before dark as a heavy rain began.

In Georgia, a white father and son charged in another killing of a black man that has raised racial tensions in the U.S. made a court appearance Thursday via video. A state investigator testified that Travis McMichael was heard uttering a racist slur as he stood over the body of Ahmaud Arbery after killing him with three blasts from a pump-action shotgun.

The new charges in Minneapolis punctuated an unprecedented week in recent American history, in which largely peaceful protests took place in communities of all sizes but were rocked by bursts of violence, including deadly attacks on officers, theft, vandalism and arson. In Minneapolis alone, more than 220 buildings were damaged or burned, with damage topping $55 million, city officials said.

Nationwide, more than 10,000 people have been arrested, an Associated Press tally found. More than a dozen deaths have been reported, though the circumstances in many cases are still being sorted out.

Meanwhile, the American Civil Liberties Union and other groups filed a lawsuit against the Trump administration, alleging officials violated the civil rights of peaceful protesters. The demonstrators were removed from a park Monday near the White House by police firing smoke bombs and pepper balls. After the protesters were cleared, President Donald Trump walked to a nearby church to take a photo.

The ACLU called it a "coordinated and unprovoked charge into the crowd of demonstrators."

The lawsuit was filed on behalf of the group Black Lives Matter D.C. and individual protesters who were in the park at the time.