Anti-globalist demonstrators have set several cars on fire in the Hamburg suburb of Altona as world leaders gather for the G20 summit.

Several police cars have been vandalized as well, according to Hamburg police, who tweeted the images of police vans with black paint and smashed windows.

Police say that there are several groups of people in the Hamburg suburb of Altona at road junctions. Officers are at the scene, urging them to disperse peacefully.

They also advised people to avoid the area to not get caught up in the chaotic scenes.

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