A moment's silence for slain police officers was interrupted by chants of 'Black Lives Matter' during the Democratic convention.
Dallas Sheriff Lupe Valdez was on stage paying a stirring tribute to the 5 officers gunned down in her city on July 7. She then asked the crowd to remember all officers who had fallen in the line of duty and said, 'Please help me to honor ALL of America's fallen officers with a moment of silence.'
Then members of the crowd shouted the controversial slogan, and it was heard all around Philadelphia's Wells Fargo Center.
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