CORVALLIS, Ore. -- Four people were arrested and another is in the hospital after a large fight broke out Monday in Corvallis involving a known Nazi sympathizer from Springfield, police said.

Just before 4 p.m. police responded to the 300 block of NW Monroe Avenue right in front of the U.S. Bank building, and the entire street was shut down.

A truck with a swastika on it and the message, "Nazi is just the N-word for white men," was parked nearby. Police said it belongs to James Marr, who has been arrested in Springfield for hate-related incidents.

Witnesses said the fight started when protesters covered up the signs on Marr's truck with blankets. Officers said Marr suffered a medical event during the fight and was taken to the hospital, but they don't know if it was directly related to the fight.

The four arrested on scene were Albert Grigorov, 22, Ralph Bolger Jr., 64, Noah Orduna, 23, and Conor Butler, 19. They were taken to the Benton County Jail, charged with second-degree disorderly conduct and released.

Marr has not been arrested, and police said they haven't interviewed him yet.

Officers said another person was involved in the fight but left before police got there.