(Portland, OR)  --  Police say they're searching for a possible second shooter in connection to a shooting that came after several hours of dueling demonstrations in downtown Portland.  The Portland Police Bureau says detectives believe there was at least one more shooter involved in the incident Sunday afternoon near Southwest 2nd Avenue and Southwest Yamhill Street.  Police arrested 65-year-old Dennis Anderson after he allegedly used a slur against a Black man standing with left-wing activists at yesterday's protest and then fired multiple shots at the group.  No one was injured.  The Oregonian reports Anderson had been standing on the fringes of the protests between the Proud Boys and left-wing counterprotesters for hours before the shooting, and that he told a reporter that left-wing activists are, quote, "the real fascists."  One witness tells KATU-2 Anderson was trying to show photos of lynchings to children in the area.