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One person has died and 19 others were injured when a car rammed a crowd of people opposing a far-right rally in the US state of Virginia, police say.
It happened after violent clashes between white nationalists attending the march and counter-protesters.
The mayor of Charlottesville, where the now-cancelled rally was taking place, said he was "heartbroken" at the death.
The "Unite the Right" march was called to protest against plans to remove a statue of a Civil War general.
A state of emergency has been declared, which has enabled police to mobilise resources.
President Donald Trump condemned "in the strongest possible terms this egregious display of hatred, bigotry, and violence on many sides".
"The hate and the division must stop right now," he told reporters, speaking in New Jersey, where he is on a working holiday. "We have to come together as Americans with love for our nation."
Video posted on social media showed a car ploughing at speed into several slow-moving vehicles, which were surrounded by a densely packed crowd.
A witness said one girl got "tore up" after the car "backed up and hit again".
Additionally, the Charlottesville Police Department said another 15 people were injured in violence related to the far-right march.
Police earlier fired tear gas against demonstrators and said that arrests had been made after a declaration of unlawful assembly at Emancipation Park.
The far-right protesters, some waving Confederate flags, carrying shields and wearing helmets, are angry about the planned removal of a statue of Gen Robert E Lee from Charlottesville.
Gen Lee commanded the pro-slavery Confederate forces in the US Civil War of 1861-65.
The New York Times reports that some of them were chanting "You will not replace us," and "Jew will not replace us."
Anti-racism organisations such as Black Lives Matter have also held marches.
