Two people were killed and 14 wounded on Saturday in a shooting at a nightclub and in nearby streets in Norway's capital Oslo, Norwegian police said.
A suspect believed to be the sole perpetrator was apprehended, police told reporters.
The crime scene extended from the London Pub via a neighbouring club and onwards to a nearby street where the suspect was apprehended a few minutes after the shooting began, police spokesman Tore Barstad told newspaper Aftenposten.
The London Pub is a popular gay bar and nightclub in the centre of Oslo.
"I saw a man arrive with a bag, he picked up a gun and started to shoot," journalist Olav Roenneberg of public broadcster NRK reported.
It was not immediately clear what was the motive for the attack. Oslo is due to hold its annual Pride parade later on Saturday.
"Two people are confirmed dead," the Oslo police department said in a tweet.
Some 14 people were taken to hospital, several with severe injuries, police said.
Photographs published by newspaper VG, broadcaster NRK and others showed a large gathering of emergency responders outside the London Pub, including police and ambulance workers.
Helicopters hovered above central Oslo while ambulance and police car sirens were heard across the city.
An overnight shooting in the Norwegian capital, Oslo, that killed two people and wounded more than a dozen is being investigated as a possible terrorist attack, Norwegian police said Saturday.
In a news conference Saturday, police officials said the man arrested after the shooting was a Norwegian citizen of Iranian origin who was previously known to police but not for major crimes.
They said they had seized two firearms in connection with the attack: a handgun and an automatic weapon.
The events occurred outside a nightclub and in nearby streets in central Oslo.
Police spokesman Tore Barstad said 14 people were receiving medical treatment, eight of whom have been hospitalized.
Olav Roenneberg, a journalist from Norwegian public broadcaster NRK, said he witnessed the shooting.
“I saw a man arrive at the site with a bag. He picked up a weapon and started shooting,” Roenneberg told NRK. “First I thought it was an air gun. Then the glass of the bar next door was shattered and I understood I had to run for cover.”
Prime Minister Jonas Gahr Stoere said in a Facebook post that “the shooting outside London Pub in Oslo tonight was a cruel and deeply shocking attack on innocent people.”
He said that while the motive was unclear, the shooting had caused fear and grief in the community.
Christian Bredeli, who was at the bar, told Norwegian newspaper VG that he hid on the fourth floor with a group of about 10 people until he was told it was safe to come out.
“Many were fearing for their lives,” he said. “On our way out we saw several injured people, so we understood that something serious had happened.”
Norwegian broadcaster TV2 showed footage of people running down Oslo streets in panic as shots rang out in the background.
Norway is a relatively safe country but has experienced violent attacks by right-wing extremists, including one of the worst mass shootings in Europe in 2011, when a gunman killed 69 people on the island of Utoya after setting off a bomb in Oslo that left eight dead.
In 2019, another right-wing extremist killed his stepsister and then opened fire in a mosque but was overpowered before anyone there was injured.
