More than two dozen people were arrested for assaults on officers, obstruction and failure to disperse. Police declared a riot Saturday afternoon after another day of peaceful protest was hijacked by looters who injured 21 police officers, lit "explosive" fires and caused widespread damage in the city's Capitol Hill neighborhood.  Hundreds of people gathered about 2 p.m. Saturday for a peaceful march in solidarity with protesters in  who are facing arrest by federal agents. By 4 p.m., crowds had broken away from the peaceful protest, setting fires to five construction...…More than two dozen people were arrested for assaults on officers, obstruction and failure to disperse. Police declared a riot Saturday afternoon after another day of peaceful protest was hijacked by looters who injured 21 police officers, lit "explosive" fires and caused widespread damage in the city's Capitol Hill neighborhood.  Hundreds of people gathered about 2 p.m. Saturday for a peaceful march in solidarity with protesters in  who are facing arrest by federal agents. By 4 p.m., crowds had broken away from the peaceful protest, setting fires to five construction...WW…