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More than 50 people have been injured and dozens detained in Stockholm after opponents of the Eritrean government stormed an event in the Swedish capital organised by regime supporters.

About 1,000 anti-government demonstrators who had been authorised to hold a protest nearby broke through a police barrier, tearing down festival tents and setting booths and vehicles on fire.

“Another public gathering took place close to the festival site, during which a violent riot broke out,” police said, adding in a statement they had detained “around a hundred people”.

Police said they remained at the scene, in a suburb north-west of Stockholm, and were “continuing their efforts to disrupt criminal acts and restore order”.

Between 100 and 200 people were detained, according to a police spokesperson. Police said they had also opened an investigation into violent rioting and arson as well as obstruction of the work of police and rescue services.

Police said at least 52 people had required medical attention, either at the scene or at local clinics and hospitals. By 7pm (15.00 GMT), 15 people had been taken to hospital, the Region Stockholm healthcare authority said in a separate statement. Eight of the people had “serious injuries”, with the other seven sustaining “minor injuries”, according to the authority, which said it had multiple units at the scene.

Sweden is home to tens of thousands of people with Eritrean roots. The festival devoted to the cultural heritage of Eritrea is an annual event that has been held since the 1990s, but it has been criticised for allegedly serving as a promotional tool and source of money for the African nation’s government, according to Swedish media.

“This is not a festival, they are teaching their children hate speech,” protester Michael Kobrab told Swedish broadcaster TV4.

Human rights groups describe Eritrea as one of the world’s most repressive countries. Since winning independence from Ethiopia three decades ago, the small Horn of Africa nation has been led by a president, Isaias Afwerki, who has never held an election. Millions of people have fled conditions such as forced military conscription.

A festival participant, Emanuel Asmalash, also spoke to TV4, accusing the protesters of being “terrorists” from Ethiopia.

Sweden’s justice minister, Gunnar Strömmer, said in a written statement to the Swedish news agency TT: “It is not reasonable for Sweden to be drawn into other countries’ domestic conflicts in this way.

“If you flee to Sweden to escape violence, or are on a temporary visit, you must not cause violence here. The police’s resources are needed for other purposes than keeping different groups apart from each other.”