A gunman has stormed a mosque in the Norwegian capital, Oslo, injuring a worshiper. The perpetrator has been detained by police, but his motive is not yet known.

The “shooting incident” occurred on Saturday afternoon at the al-Noor Islamic Centre, local police confirmed.

Described as a “young white male,” the attacker made his way into the building then opened fire.

He injured one person and, so far, there have been no reports on the victim’s condition.

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Witnesses said the attacker was armed with a shotgun and pistols, wearing a bulletproof vest and a helmet. He started shooting all around him after entering the mosque, but was overpowered by three worshipers.

Local media reported several police and emergency response vehicles on site, with a medical helicopter hovering overhead.

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