German Chancellor Angela Merkel has said “vigilante justice” will not be tolerated after far-right unrest over a murder in the eastern city of Chemnitz.
Scuffles have broken out during two days of protests by hundreds of people in the city centre since a German was stabbed to death early on Sunday.
A Syrian man and an Iraqi man have been arrested on suspicion of murder.
Police were still out in strength on Monday evening, braced for new demonstrations by both right and left.
They are also investigating alleged assaults on an Afghan, a Syrian and a Bulgarian during the unrest.
Reports have spoken of aggressive protesters chasing foreigners, though there are few details, and police have appealed for witnesses to the assaults to hand over any video they may have recorded.
A far-right football fan group called Kaotic Chemnitz had earlier called out supporters to show “who is in charge”, while protesters on Sunday could be seen chanting “We are the people!” and “This is our city!”.
Bottles were thrown on Sunday by protesters at police, who were reinforced by officers from other cities.
