DEMOCRATIC NATIONAL CONVENTION - Black Lives Matter chants interrupt one minute silence for fallen police officers - led by their grieving relatives - at the DNC

Dallas Sheriff Lupe Valdez was paying tribute to cops killed in line of duty

She then asked for a moment of quiet reflection from the delegates 

However, some were heard shouting the controversial slogan 

Valdez ignored the jeers and then introduced families of murdered officers

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 five officers who were gunned down in her city on July 7.

The veteran officer then asked the crowd to remember all of the cops who had fallen in the line of duty with a quiet moment of reflection.

She 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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