Video shows a group of demonstrators walking on the crosswalk when the driver runs a red light and almost hits some of the pedestrians. The driver makes a U-turn and is heard yelling profanity at them.
Footage goes on to show the man pull over, exit the car and yell "F- China" at the protesters.
The Los Angeles County Sheriff's Department says the incident during the "Stop Asian Hate" rally happened at the intersection of Grand Avenue and Diamond Bar Boulevard around noon Sunday. The suspect was last seen driving southbound on Grand Avenue before leaving the scene.
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"The brazenness of doing this at an Anti-Hate rally speaks to the level that people will go to harass and bully communities of color," L.A. County Supervisor Janice Hahn said in a statement.
L.A. County Sheriff Alex Villanueva announced the confrontation is being investigated as a hate crime. According to a news release, the suspect's vehicle license plate was captured on video and investigators are attempting to identify the male suspect in his 50s.
No injuries were reported during the incident, according to the sheriff's department.