A rally by a white nationalist group at California’s State Capitol in Sacramento became violent on Sunday when protesters clashed with the group, leaving at least 10 people hurt, two of them critically, fire officials said.

Videos posted on Twitter showed members of the nationalist group, the Traditionalist Worker Party, which had obtained a permit to demonstrate, brawling on the Capitol grounds with protesters who were dressed in black and concealed by face coverings.

It was unclear whether the protesters were affiliated with any organization. Chris Harvey, a Fire Department spokesman, described them as “left-wing, anarchist types.”

“It was a very chaotic situation,” he said. “All we could do was just grab, load and go.”

The two critically injured people were expected to survive, fire officials told The Associated Press. At least eight others were reported to have suffered various cuts, bruises and stab wounds.