(Portland, OR) -- An investigation is ongoing into a confrontation between drivers and demonstrators at Interstate Avenue and Killingsworth Street. KATU-2 reports video of yesterday afternoon's incident circulating on social media shows people confronting each other with guns drawn. Demonstrators were marching for justice for Patrick Kimmons, a Black man who was shot to death by police in 2018. Kimmons's mother says the confrontation started after a driver started speeding toward the group of demonstrators and then yelled a racial slur at them. One of the drivers tells police that people surrounded their vehicle, broke its windows and damaged its tires before spraying some sort of irritant at them.