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Demonstrators at one of the many sit-ins in Hamburg. The protest titled “Welcome to Hell” against the G-20 summit where the leaders of the group of 20 meet to discuss climate change, free trade and mass global migration. Photo: AP

German police used water cannons and pepper spray to disperse the anti-capitalist protest. The march turned violent after police interrupted the protest 300 meters into its route. Photo: AP

Paramedics carry a person out of the 12,000-strong demonstration; with several protesters suffering injuries. Hamburg police said 74 officers sustained injuries, although majority of the injuries were minor. Photo: AP

Protesters attempted to enter the restricted “red zone” close to where the summit is being held. Participants of the “Color the Red Zone” protest attempted to disrupt the summit and inconvenience participants. Photo: AP

Hours after the protests turned violent, police directed peaceful protesters to distance themselves from the violent ones. Protesters were seen throwing rocks, Molotov cocktails, firecrackers and other pyrotechnics. Photo: AP

Smoke can be seen across the Hamburg horizon in the early hours of Friday. As protesters set fire to vehicles and other pyrotechnic materials. Photo: AP

The latest rounds of the protest are said to be small and unorganised, yet unruly. Police asked residents to avoid the area near the Hamburg-Altona Railway Station where multiple vehicles were gutted. Photo: AP

Hamburg has a history of anarchist, left-wing and squatter violence, with the initial skirmishes occurring on the famous Hafenstrasse road. Late in the evening, approximately 8,000 protesters regrouped in Hamburg’s red light district for a peaceful march. Photo: AP

Protesters were heard chanting anti-Trump and anti-capitalist slogans, but the main concern was the exclusivity of the G20 summit, with the wealthiest twenty countries making decisions on behalf of the rest of the world. Photo: REUTERS