Plans by a far-right group to publicly burn copies of the Koran have sparked violent clashes with counter-demonstrators for the third day running in Sweden.

Twenty-six people were arrested over the weekend during fighting in the neighboring eastern cities of Norrkoping and Linkoping.

On Sunday, clashes erupted in both cities for the second time in four days over rallies by anti-immigration and anti-Islam group Hard Line, led by Danish-Swedish politician Rasmus Paludan.

Police said officers wounded three people after firing warning shots during Sunday's clashes.

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In eastern Norrkoping, "during an attack on the police, warning shots were fired. As a result of these shots, a man may have been hit in the leg by a ricochet," the police said in a statement.

Paludan, a lawyer and YouTuber who plans to stand in September's Swedish legislative elections but does not yet have the required number of signatures to secure his candidature, is currently on a self-styled "tour" of Sweden.

The 40-year-old is visiting neighborhoods with large Muslim populations where he wants to burn copies of the Muslim holy book as worshippers observe the holy month of Ramadan.

In Malmo, where he burned a Koran on Saturday, fire erupted in a school overnight, officials said. 

Hard Line's rallies have sparked several clashes between the police and counter-protesters across the Scandinavian country in recent days.

On Thursday and Friday, around 12 police officers were injured in the clashes.

In total eight people were arrested in Norrkoping and 18 in Linkoping.

Clashes on Saturday broke out after a rally by the group's supporters.

Three police officers had to be taken to hospital after a riot broke out in Linkoping on Thursday. Two people were arrested at that protest. On Friday, nine police officers were injured in similar clashes in Orebro in central Sweden. 

In the wake of the incidents, Iraq's foreign ministry said that it had summoned the Swedish charge d'affaires in Baghdad. It warned that the affair could have "serious repercussions" on "relations between Sweden and Muslims in general, both Muslim and Arab countries and Muslim communities in Europe." 

Paludan plans to hold further rallies in two other cities in Sweden, but the demonstrations have not received permission by police.