Punches and objects were thrown, prompting Virginia Governor Terry McAuliffe to declare the state of emergency.
The Dodge Challenger, with OH license plates, killed one person and injured 35 others in a crowd of counterprotesters gathered to oppose a "Unite the Right" rally of white nationalist groups, according to the Associated Press.
The woman was killed when a auto plunged into a crowd of people peacefully protesting the rally.
Mr Fields Jr, of Maumee, Ohio, was later arrested and charged with murder, malicious wounding and failing to stop at a deadly accident, according to police.
The unrest in Charlottesville, Virginia, intensified on Saturday, as vehicle plowed into a group of counter-protesters at a white nationalist rally, killing three and injuring more than 30 others, the Associated Press reports.
U.S. Rep. Trent Franks said President Donald Trump "made it extremely clear" that he condemns the white supremacist violence amid criticism that the president's message wasn't strong enough. You are not wanted in this commonwealth.
President Donald Trump has come under fire, including from fellow Republicans, for his apparent refusal to criticize far-right hate groups.
Authorities say an OH man driving the auto was charged with second-degree murder.
After an immediate outcry on social media over Trump's "many sides" wording, a White House spokesperson confirmed that Trump meant what he said, since "there was violence between protestors and counter-protestors today". "Shame on you. You are anything but a patriot".
Police said their helicopter was "assisting public safety resources" as the events unfolded in Charlottesville, and that there was no indication that foul play was a factor in the crash.
The "Unite the Right" rally was a battle over the city's ordered removal of a statue of Confederate Gen. Robert E. Lee. My brother didn't give his life fighting Hitler for Nazi ideas to go unchallenged here at home.
"Make no mistake: The white supremacists in #Charlottesville feel emboldened by the Trump Admin".