At least 10 were injured by knives in a melee that broke out between a white nationalist group, the Traditionalist Worker Party, and about 400 counter-protesters at the California state Capitol building.
Police have yet to arrest anyone, the Associated Press reported.
At least two of the stabbing victims were taken to the hospital for treatment of critical wounds, emergency response officials said.
The TWP has been characterized by the Southern Poverty Law Center as a white nationalist organization, but bills itself as the nation’s “first political party created by and for working families” to defend “against the politicians and oligarchs who are running America into the ground.”
The group had a permit to rally for two hours in front of the Capitol in order to protest globalization.
Roughly 400 counter-protesters showed up, as well – about ten times the number of TWP members who rallied. The fights broke out when people were trying to leave, said California Highway Patrol Officer George Granada.
Meanwhile, Sacramento Fire Department spokesman Chris Harvey said nine men and one woman, between the ages of 19 and 58, were treated for various stab wounds, cuts and bruises.
“Thre was a large number of people carrying sticks and rushing to either get into the melee or see what was going on,” Harvey said, in the AP report.