Three men were injured early on Sunday during an attack on a pro-democracy vigil outside the Iranian embassy in Berlin, German police said.
Several men, whose faces were covered with scarves, tore down flags and banners from a caravan parked outside, an officer guarding the property said.
They then tried to rip open the door of the caravan, and a scuffle and argument erupted between them and four men inside.
The men from the caravan chased the other group and were then attacked by them, police said. Three of the men from the vehicle were injured, with two needing hospital treatment.
The attackers fled by car.
The caravan had posters on it with slogans such as "Women, Life, Freedom", German media reported.
The slogan has been commonly used in anti-government protests in Iran since the death of Mahsa Amini, 22, in "morality police" custody.
There have been large protests in Germany and other European countries in solidarity with the women-led demonstrations in Iran.
Iran protests 40 days since Mahsa Amini's death - in pictures
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An unveiled woman stands on top of a vehicle as thousands make their way towards Aichi cemetery in Saqez, Mahsa Amini's home town, to mark 40 days since her death. AFP -
Protesters attempt to dodge projectiles fired at them during clashes at Iran's Islamic Azad University in Tehran. AFP -
Protesters gather at Amirkabir University of Technology in Tehran. AFP -
A man, bottom left, fires a weapon during the clashes at Islamic Azad University. AFP -
Protesters chant at a vigil for Amini at the entrance of the Khajeh Nasir Toosi University of Technology in Tehran. Reuters -
Iranian police arrive to disperse a protest marking 40 days since Amini's death. AP -
People block an intersection during a protest to mark 40 days since Amini's death. AP -
People march down the motorway towards Aichi cemetery near Saqez, where Amini is buried. Reuters -
People march towards Aichi cemetary. Reuters -
Protesters walk towards the cemetery. Reuters -
A view of demonstrators walking to the cemetery. Reuters -
Cars line the street as people march towards the cemetery. Reuters -
Protesters march towards the cemetery 40 days after Amini's death. Reuters
The Iranian protests, now in their seventh week, are the biggest seen in the country for years.
On Sunday, Foreign Minister Annalena Baerbock said Germany and the EU were examining whether to classify Iran's Islamic Revolutionary Guard Corps as a terrorist organisation.
"I made it clear last week that we will launch another package of sanctions, that we will examine how we can also list the Revolutionary Guards as a terrorist organisation," Ms Baerbock told the ARD broadcaster on Sunday.
Alternative Mahsa Amini protests - in pictures
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Swedish-Iranian director Ali Abbasi shows his support for the protests against Iran as he attends the UK premiere of his film, 'Holy Spider', at the 66th BFI London Film Festival. The protests were sparked by the death of a young woman, Mahsa Amini, in police custody in Iran. Getty -
A mural in Milan, Italy, shows Marge Simpson, a character in the animated sitcom 'The Simpsons', cutting her hair in protest over the death of Amini. EPA -
Actress Juliette Binoche cuts her hair as a part of the protest against Iran. Reuters -
Protester hold up placards in Rome as they denounce the Iranian government after Amini's death. AFP -
Actress Marion Cotillard cuts her hair as a part of the protests. Reuters -
People hold up a placard bearing a picture of Amini during a demonstration in solidarity with the Iranian people, near the European Parliament in Strasbourg, France. EPA -
Iranian-born actress Nazanin Boniadi addresses demonstrators at a rally held in support of Iranian women, outside City Hall in Los Angeles, California. Reuters -
An Iranian woman living in Turkey takes part in a protest near the Iranian consulate in Istanbul, Turkey. Reuters -
A demonstrator holds cut hair during a protest near the Iranian consulate in Istanbul. Reuters -
Protesters hold up placards in Rome during a demonstration in solidarity with Iranian women. AFP
The head of the Revolutionary Guards warned protesters that Saturday would be their last day of taking to the streets, in a sign that security forces may intensify their fierce crackdown on widespread unrest.
Germany last week said it was tightening entry restrictions for Iranians beyond an already announced EU sanctions package.
Ms Baerbock also said there were no negotiations about the nuclear agreement between Iran and the West.
