<p>Police used water cannons to disperse crowds demonstrating the start of the G20 summit in Hamburg on July 6 after clashes between protesters and police. This video shows riot police moving forward with the water cannons as protesters move back.</p><p>Heavy security was present from the outset of the protest as police warned protestors</a> the rally would not go ahead unless individuals removed masks covering their faces. Credit: Instagram/Elbnessi via Storyful</p><br />
