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Against the background of the so-called Rondenbarg trial in connection with riots around the G20 summit three and a half years ago, left-wing demonstrators took to the streets in Hamburg on Saturday.
The police spoke of around 2,000 demonstration participants who moved from the main train station through the city center towards St. Pauli in the afternoon.
Various left groups throughout Germany called for the protest, including those classified as extremist such as the Interventionist Left.
They called for "resistance to repression" and solidarity with the defendants in the trial that began last week.
The protection of the constitution had warned against participation.
"Anyone who takes part in this meeting makes common with violent left-wing extremists," it said in a statement.
To protect against infection, the demonstration was divided into blocks.
The police accompanied him with strong forces.
Water cannons were also ready.
Occasionally, demonstrators ignited pyrotechnics.
There were initially no major riots.
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In the "Rondenbarg trial" since Thursday, five young people have had to answer before the Hamburg district court for a serious collective breach of the peace in unity with assault on enforcement officers and attempted dangerous bodily harm.
The defendants, who are now 19 to 21 years old, are said to have participated in a march of 150 to 200 G20 opponents dressed in black in July 2017, from which stones were thrown at the police.
The federal police had stopped the march in the street Rondenbarg, an industrial area not far from the Volksparkstadion.
No one was injured by the officers.
On the other hand, according to earlier information from the police, at least 14 G20 opponents suffered severe injuries when they tried to escape over a railing.
There had already been protests at the start of the trial.