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A man suspected of killing five people with a bow and arrows in had converted to and was previously known to police over fears that he had become radicalised, officials said on Thursday.

Five people were killed - four women and one man - aged between 50 and 70 - and two others were injured on Wednesday in the town of Kongsberg in Norway's deadliest attack in a decade.

"We're talking about a convert to Islam," Norwegian police official Ole Bredrup Saeverud told reporters on Thursday, adding: "There were fears linked to radicalisation previously."

Saeverud said the 37-year-old suspect had confessed during questioning.

"We are investigating among other things to determine whether this was a terrorist attack," he added.

Reports that linked him to radicalisation pre-dated this year, Saeverud said, and police had followed up at the time. "We haven't had any reports about him in 2021, but earlier," he said.

"We're relatively sure that he acted alone."

Murder in Norway is rare.

It was the deadliest attack in the Scandinavian country since far-right extremist Anders Behring Breivik killed 77 people in 2011. Since then, Norway has seen one other far-right attack, carried out by a self-proclaimed neo-Nazi who opened fire into a mosque.

After Wednesday's attack, Denmark's Prime Minister Mette Frederiksen said it was "with great sadness" that she had heard about the "terrible attack" in the south-eastern Norwegian town of Kongsberg.

'Running for their lives'

"My thoughts and deepest sympathies go to the victims and their loved ones," she said.

UN Secretary General Antonio Guterres meanwhile said on Twitter he was "shocked and saddened by the tragic news coming from Norway."

The suspect was due to go before a judge on Thursday or Friday for a custody hearing, his lawyer told AFP.

"He is explaining in detail and he is speaking and cooperating with the police," the lawyer, Fredrik Neumann, told reporters earlier.

The victims have not yet been named publicly, but one of the wounded was an off-duty police officer who had been in a store, one of the places attacked.

Norwegian media also wondered why it took police more than a half-hour after the first reports of the attack to arrest the suspect.

Police were informed of the attack at 6:13 pm (8:13 pm GMT) and the suspect was arrested at 6:47 pm.

A witness, identified only as Hansine, told TV2 she had heard a disturbance, then saw a woman take cover and "a man standing on the corner with arrows in a quiver on his shoulder and a bow in his hand".

"Afterwards, I saw people running for their lives. One of them was a woman holding a child by the hand," she said.

Arrow stuck in wall

Images in the media showed a black arrow sticking out of a wall and what looked like competition-grade arrows lying on the ground.

Police said on Thursday the suspect had also used other weapons.

"These events shake us," said Prime Minister Erna Solberg, who steps down on Thursday, to be replaced by Jonas Gahr Store, whose Labour Party won recent parliamentary elections.

Norway far-right extremist sentenced to a minimum of 21 years for 2019 mosque attack and racially-motivated murder of step-sister

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Norwegian police are not normally armed, but after the attack, the National Police Directorate ordered that officers be armed nationwide.

Norway's intelligence service PST had been alerted, spokesman Martin Bernsen told AFP.

Norway rarely experiences such violence, but 10 years ago Anders Behring Breivik killed 77 people in the country's worst massacre since World War II.

Breivik first set off a bomb in Oslo next to the building that housed the office of the prime minister, then went on a shooting spree at a summer camp for left-wing youth on the island of Utoya.

In August 2019, self-proclaimed neo-Nazi opened fire into a mosque on the outskirts of Oslo before being overpowered by worshippers, with no one seriously injured.

He earlier shot dead his step sister, who had been adopted from China, in what prosecutors termed a "racist act".

Several planned jihadist attacks have also been foiled by security services.