Tens of thousands of people defied curfews for an eighth night of protests over the death of George Floyd in police custody, as National Guard troops lined the steps of Washington's Lincoln Memorial.
Clashes between protesters and police and looting of some stores in New York City gave way to relative quiet by night's end.
In Los Angeles, numerous demonstrators who stayed out after the city's curfew were arrested. But by late evening, conditions were quiet enough that local television stations switched from wall-to-wall coverage back to regular programming.
Large marches and rallies also took place in Philadelphia, Atlanta, Denver and Seattle.
A protester hugs an LAPD officer in Hollywood, Los Angeles, during a George Floyd demonstration. Source: EPA
In Portland, Oregon, crowds seemed to swell before 11 pm local time.
Police used stun grenades and tear gas on the crowd, calling it an "unlawful assembly."
The scattering crowd shouted "peaceful protest," back at police.
Although rallies on behalf of Mr Floyd and other victims of police brutality have been largely peaceful during the day, after dark each night crowds have turned to rioting, vandalism, arson and looting.
On Monday night, five police officers were hit by gunfire in two cities.
Peaceful protests in George Floyd's hometown of Houston. Source: AP
Outside the US Capitol building on Tuesday afternoon a throng took to one knee, chanting "silence is violence" and "no justice, no peace," as officers faced them just before the government-imposed curfew.
The crowd remained after dark, despite the curfew and vows by President Donald Trump to crack down on what he has called lawlessness by "hoodlums" and "thugs," using National Guard or even the US military if necessary.
Some protesters briefly pushed and rocked a chainlink fence, but were encouraged other protesters to stop. Local news media reported that the crowds dwindled by midnight.
Protests coast to coast
In New York City, thousands of chanting protesters ignored an 8 pm curfew to march from the Barclays Center in Flatbush toward the Brooklyn Bridge as police helicopters whirred overheard.
The crowd, halted at an entrance to the Manhattan Bridge roadway, chanted at riot police: “Walk with us! Walk with us."
On Hollywood Boulevard in Los Angeles, hundreds of people filled the street, marching past famous landmarks of the film centre
Others gathered outside Los Angeles Police Department headquarters downtown, in some cases hugging and shaking hands with a line of officers outside.
A supporter holds a photo of George Floyd on the site where the 46-year-old died in police custody. Source: Star Tribune
Los Angeles was the scene of violent riots in 1992, following the acquittal of four policemen charged in the beating of black motorist Rodney King, that saw more than 60 people killed and an estimated $1 billion in damage.
A Reuters/Ipsos poll released on Tuesday found a majority of Americans sympathise with the protests.
The survey conducted on Monday and Tuesday found 64 per cent of American adults were "sympathetic to people who are out protesting right now," while 27% said they were not and 9% were unsure.
More than 55 per cent of Americans said they disapproved of Mr Trump's handling of the protests, including 40 per cent who "strongly" disapproved, while just one-third said they approved - lower than his overall job approval of 39 per cent, the poll showed.
America is a battleground
In Minneapolis, Roxie Washington, mother of Mr Floyd's 6-year-old daughter, Gianna, told a news conference he was a good man.
"I want everybody to know that this is what those officers took from me....," she said, sobbing.
"Gianna does not have a father. He will never see her grow up, graduate."
Mr Floyd died after a white policeman pinned his neck under a knee for nearly nine minutes in Minneapolis on 25 May, reigniting the explosive issue of police brutality against African Americans five months before the November presidential election.
Hundreds of demonstrators march toward Lafayette Park and the White House to protest against police brutality and the death of George Floyd. Source: Getty Images North America
The officer who knelt on Mr Floyd, 44-year-old Derek Chauvin, has been charged with third-degree murder and second-degree manslaughter.
Three other officers involved were fired but not yet charged.
Mr Trump has threatened to use the military to battle the violence and has derided local authorities, including state governors, for their response to the disturbances.
The head of the US National Guard said on Tuesday 18,000 Guard members were assisting local law enforcement in 29 states.
The Pentagon said it has moved about 1,600 U.S. Army troops into the Washington, D.C., region.
Mr Trump's rhetoric and the growing role of the U.S. armed forces has alarmed some current and former officials.
"America is not a battleground. Our fellow citizens are not the enemy," Martin Dempsey, a retired four-star general who served as chairman of the Joint Chiefs of Staff, wrote on Twitter.
