Portland police said Monday that they are looking for another shooter or shooters after arresting a man suspected of opening fire at a protest in downtown Portland Sunday afternoon. Dennis G. Anderson, a 65-year old Gresham resident, faces allegations of unlawful use of a weapon and unlawful possession of a firearm after police said he fired on a group of demonstrators around 5:45 p.m. Multiple videos posted to social media show a man standing behind a trash bin near Southwest Yamhill Street and Southwest Second Avenue aiming a silver-and-black handgun and firing multiple shots across the street. A video taken...