(Portland, OR)  --  Thousands of people flocked to Portland's streets last night for a fourth night of protests over the police killing of George Floyd in Minneapolis.  Protesters took to the Burnside Bridge, where they lied face-down in the street with their hands behind their backs and remained silent for nearly nine minutes.  That's how long police officers knelt on Floyd's neck last week, reportedly suffocating him to death.  Protesters then marked downtown and gathered at Pioneer Courthouse Square before continuing their march.  The Portland Police Bureau says the protest was peaceful with no reports of vandalism or destruction.