(Portland, OR)  --  Portland Police Bureau Chief Jami Resch is saying "thank you" to protesters for last night's peaceful demonstration.  Resch took to Twitter early this morning praising the thousands of demonstrators who participated in an extensive march without engaging in violence or destruction.  Resch says the effort created a safer environment for all.  She added that police will continue to arrest anyone who does engage in acts of violence or other criminal activity.  Police say they arrested about a dozen people after some agitators started throwing rocks and bottles at officers after the protest started to wrap up.