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A person has been shot as a gunman stormed a mosque in Oslo, Norway.

A man has been arrested in connection with the shooting, which happened on Saturday afternoon.

It is not yet known how seriously the victim was injured at the al-Noor Islamic Centre.

The gunman was said to be a white man wearing a helmet and a uniform. Police confirmed it was being investigated as a possible act of terror.

The gunman smashed through the glass door but was overpowered by members of the congregation.

Irfan Mushtaq, at the scene, told Budstikka : "One of our members has been shot by a white man wearing a helmet and uniform."

Police in Oslo posted on Twitter that there had been a "shooting incident".

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(Image: TERJE PEDERSEN/EPA-EFE/REX)

The tweet continued: "One person is shot. Their injuries are unknown. A perpetrator has been arrested."

In a further tweet, investigators wrote: "Nothing indicates that there have been more people involved."

A number of ambulances are at the mosque.

It happened shortly after 4pm local time inside the building.

The suspected attacker at the al-Noor Islamic Centre near the country's capital was described as "a young white man" who appeared to have acted alone, the police added.

"He is around 20 years old, a Norwegian citizen from the area," assistant chief of police Rune Skjold told Reuters.

"The man carried two shotgun-like weapons and a pistol. He broke through a glass door and fired shots," mosque director Irfan Mushtaq told TV2.

This evening, a man was found dead at an address in Baerum. Police say it is linked to the mosque shooting, according to NRK.

We'll be bringing you the very latest updates, pictures and video on this breaking news story.