Paludan had threatened to hold another rally in Norrköping on Sunday, prompting counter-demonstrators to gather there, Deutsche Welle reported.

Local police said in a statement that they fired warning shots after coming under attack and three people were apparently hit by ricochets.

Sweden's national police chief Anders Thornberg said in a statement on Saturday that demonstrators had shown an indifference to the lives of police officers, adding: "We have seen violent riots before. But this is something else."

Protests against plans by Stram Kurs to burn the Quran have turned violent in Sweden before. In 2020, protesters set cars on fire and shop fronts were damaged in clashes in Malmö.

Paludan - who was jailed for a month in 2020 for offences including racism in Denmark - has also attempted to plan similar burnings of the Quran in other European countries, including France and Belgium.