No never heard it. You need evidence to support your accusation.
You are trying to paint police as bad guys when the fact is just the opposite. It is so evident that the demonstrators crossed the line during G20. We can argue that the police could do better during G20 demonstration but by no means it justifies what those mobs and thugs did.
世界日报：周六占领卑街 忧G20冲突再现