Protesters against the burning of a Koran by far-right supporters in Sweden clashed with police during several hours of riots.
Cars were set on fire and storefronts damaged in clashes in the southern city of Malmö which are now under control. There have been several arrests.
Earlier on Friday, police banned Danish far-right politician Rasmus Paludan from attending the rally to burn the Koran.
His supporters went ahead despite everything.
Swedish police returned Mr Paludan to the border, saying there was a two-year entry ban for him.
The leader of the Danish far-right party Stram Kurs (hard-line) was sentenced to one month in prison for a series of offenses, including racism, in Denmark earlier this year.
He was found guilty of posting anti-Islam videos on his party’s social media.