Police have blasted both sides involved in a series of right-wing protests and left-wing counter-demonstrations that shut down a part of the CBD for hours, claiming the messages had been lost amid scenes of violence.

Victoria Police deployed capsicum spray and the horse squad, as well as more than 400 uniformed officers, in a bid to control crowds near Parliament House on Saturday.

"I think the message of the day from either side has been lost, I think they need to sit back and think about that. From a policing point of view, all the vision, all the Twitter feeds, all the Facebooks that I've seen is all about the violence against our police members and police horses," Assistant Commissioner Stephen Leane said.

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