Imperial Beach Mayor Serge Dedina requested Sunday that the San Diego Sheriff's Department investigate an attack on peaceful protesters and deem the incident a hate crime.
The Imperial Beach protest was one of many demonstrations throughout San Diego County on Sunday which opposed racism, inequality within the justice system and police brutality against people of color.
The action occurred Sunday afternoon at the Imperial Beach Pier Plaza during a peaceful protest, Dedina said over Twitter.
"We cannot allow the ugly legacy of violent racism and white supremacy to continue in our beach city," the mayor wrote.
According to the San Diego County Sheriff's Department, the demonstrator told authorities he was punched by another man after a verbal confrontation. The suspect then ran away with two others.
The man was not seriously hurt and didn't require medical attention.
A man believed to be the suspect was later contacted by SDSO but the victim and other witnesses could not identify him. As of Monday, no arrests have been made and the investigation is ongoing.
All the other Black Lives Matter protests throughout the county were reported to be peaceful.