Police and protesters have clashed in the German city of Hamburg where the G20 is due to start on Friday.
Police fired water cannon at a march attended by thousands carrying banners with slogans such as "Welcome to hell" and "Smash G20".
World leaders including US President Donald Trump are in Hamburg for talks on a wide range of issues.
They face their own disagreements, including over climate change and trade.
TV pictures showed masked black-clad anti-capitalist activists hurling bottles, stones and other objects at police in riot gear. Medics were seen treating several people. Other protesters were building makeshift barricades on streets.
Up to 100,000 protesters are expected in Hamburg during the summit. Earlier, police had warned of possible violence and said they had confiscated a number of homemade weapons.
Mr Trump has already met German Chancellor Angela Merkel and the pair spent an hour talking about North Korea, the Middle East, the conflict in eastern Ukraine and G20 issues, a German government spokesman said.
Last week Mrs Merkel said the G20 would focus on the Paris climate deal - which the US has withdrawn from. But earlier she said that as the G20 host she would work to find compromises.
The summit will also see Mr Trump meet Russian President Vladimir Putin for the first time. The meeting will take place at 14:45 local time (13:45 GMT) and last for an hour, Russian media report.
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