A man armed with a bow and arrows killed five people and wounded two others in southeastern Norway on Wednesday, police said, adding that they had arrested the suspect.
The motive for the attack, which took place in several locations in the town centre of Kongsberg, was unknown, but police said terrorism could not yet be ruled out.
Police official Oyvind Aas said he could "unfortunately confirm" that five people were dead. The two wounded were in critical care units in hospital but their lives did not appear to be in danger, he told a news conference.
One of the wounded was an off-duty police officer who had been in a store, one of several places attacked.
"The man who committed this act has been arrested by the police and, according to our information, there is only one person involved," Aas said.
He added that "given how events unfolded, it is natural to assess whether this is a terrorist attack".
"The arrested man has not been interviewed and it is too early to say anything about his motives," he said, adding that "all possibilities were open".
The TV2 channel said that the alleged attacker is a Norwegian and has a medical history -- information that the authorities did not confirm.
A woman who witnessed some of the attack, Hansine, told TV2 she had heard a disturbance, then saw a woman taking 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.
Police said the suspect had been taken to a police station in the nearby town of Drammen but gave no other details about the man, including whether he had previously been known to authorities.
Police were informed of the attack at 6:13 pm (1613 GMT) in the town of 25,000 people around 80 kilometres (50 miles) west of the capital Oslo. The suspect was arrested at 6:47 pm.
"These events shake us," said Prime Minister Erna Solberg on her last day in office.
On Thursday, she will hand over the prime ministership to Jonas Gahr Store, whose Labour Party won parliamentary elections.
In Kongsberg, police blocked off the scene of the attack while urging the public to stay at home.
Television footage showed ambulances and armed police in the area. A helicopter and bomb disposal team were also sent to the scene.
Police in the Scandinavian country 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.
"It is all conjecture at the moment," he said when asked about the possibility of a terrorist motive.
The website of public broadcaster NRK published an image sent by a witness of a black arrow sticking out of a wall.
In other pictures what looked like competition-grade arrows could be seen lying on the ground.
Norway rarely experiences such violence, but 10 years ago far-right extremist 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 another right-wing attack, self-proclaimed neo-Nazi Philip Manshaus opened fire into a mosque on the outskirts of Oslo in August 2019 before being overpowered by worshippers, with no one seriously injured.
Several planned jihadist attacks have also been foiled by security services.
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