He did not provide details. According to multiple news outlets, torch-wielding racists marched through university grounds chanting "Jews will not replace us", and "white lives matter".
The march began at approximately 9.30pm and lasted for around 15 minutes before ending in fights with the counter protesters.
Nigro says it was "chaos and mayhem" as bodies flew. It wasn't immediately clear how many demonstrators remained in other parts of the city.
There are also multiple reports of pepper spray being used.
Trump took to Twitter early Saturday afternoon to condemn the violence, hours after Virginia Governor Terry McAuliffe declared a state of emergency in an attempt to quell the unrest. Police in riot gear ordered demonstrators to disperse as they marched onto the scene Saturday.
Counter-protestors also committed acts of violence, including dousing HuffPost reporters with raw sewage.
Some of the white nationalists cited Trump's victory as validation for their beliefs.
"Many of the individuals coming to Charlottesville are doing so in order to express viewpoints many people, including me, find abhorrent".
Police deployed tear gas against the crowd shortly before 11:30 a.m.
"Both sides are hoping for a confrontation", he said.
BLM joins dozens of other groups to protest the rally, saying that they plan to out number the rally-goers.
"White supremacists have descended upon Charlottesville again to evoke a reaction as ugly and violent as their beliefs", he said. Up to 6,000 people are expected to join the event, according to police estimates.
Organizers say the Unite the Right rally on Saturday aims to "unify the right-wing against a totalitarian Communist crackdown" and to protest "displacement level immigration policies" in the United States and Europe.
The Southern Poverty Law Center describes the rally as "the largest hate-gathering of its kind in decades".
He blamed Charlottesville officials for cancelling the rally.
Noting that most of the protesters were from out of the state, McAuliffe said the emergency was declared to assist local government in restoring public safety.
Police instituted road closures around downtown, and many businesses in the popular open-air shopping mall opted to close for the day.
Another witness had two friends who were hit by the vehicle and had to take them to the hospital.
On Friday night, hundreds of white nationalists carrying torches and chanting "white lives matter", "you will not replace us", and the Nazi-associated phrase "blood and soil" marched near a statue of Thomas Jefferson on the grounds of the University of Virginia, and were met by counterprotesters.
Fighting has broken out at a "Unite the Right" rally in Charlottesville, Virginia between right-wing protesters demonstrating against the removal of a Confederate-era statue from Emancipation Park, and counter demonstrators.