Three people have been killed and four more are fighting for their lives in hospital after a shooting at a shopping centre in Copenhagen, close to the venue for a Harry Styles concert.
Emergency services were scrambled to the gunfire at Field's Mall in the Danish capital city shortly after 5.30pm local time yesterday.
The man responsible, identified only as a 22-year-old "ethnic Dane", was jailed for 24 days today after facing preliminary questioning in a city court, Danish police said.
He has been arrested and charged with manslaughter and intent to kill and will remain in custody in a closed psychiatric ward.
Three people were killed in the attack, including two Danish 17-year-olds and a 47-year-old Russian man, with four others critically injured at the time, local media reports.
Three of the victims have been stabilised, with one still in critical condition, according to the Danish emergency services.
The wounded included two Swedish citizens, a 50-year-old man and a 16-year-old woman.
A number of people were slightly injured when fleeing the scene, but not by gunshots.
At the time of his arrest, the man was in possession of a rifle, ammunition and a knife.
He was seen prowling the shopping centre armed with a rifle traditionally used for hunting in rural Denmark.
Videos from the mall showed people screaming and running in terror. Footage posted on social media appears to show the moment the gunman was detained.
During a press conference held this morning police confirmed the shooter was known to Danish mental health services.
Police chief Soren Thomassen said: "Our suspect is also known among psychiatric services, beyond that I do not wish to comment."
At a later press conference, cops said the attack could not be viewed as an "act of terror" based on current evidence.
Thomassen told reporters there was no indication the suspect had acted together with others.
"There has been some sort of deliberation and preparation (by the suspect) up to this terrible event," Thomassen told a news conference without providing details on the perpetrator's possible motives.
"Our current assessment is that these are random victims."
The Watermelon Sugar singer scrapped his planned gig and said the shooting had left him 'heartbroken'.
The suspected gunman - a 22-year-old man- was arrested at the scene by Danish police. Terrorism has been ruled out as a motive and he has been charged with manslaughter.
"Denmark was hit by a cruel attack on Sunday night. Several were killed. Even more wounded," Prime Minister Mette Frederiksen said in a statement late on Sunday.
"Innocent families shopping or eating out. Children, adolescents and adults.
"Our beautiful and usually so safe capital was changed in a split second," she said. "I want to encourage the Danes to stand together and support each other in this difficult time."
Police launched a massive search operation throughout the local Zealand region early Sunday evening in search of any accomplices, although police later said they thought the gunman acted alone.
Copenhagen police chief Soren Thomassen said a boy and a girl, both aged 17 and from Denmark, were killed in the attack, Danish tabloid BT reports.
A 47-year-old man with Russian citizenship also died, Mr Thomassen said.
Meanwhile, four people are in a "critical condition" in hospital, according to BT.
The injured include two teenage girls, aged 16 and 19, alongside a 40-year-old woman and a 50-year-old man.
Mr Thomassen confirmed the weapons used in the attack were legal, although the suspect did not have a permit for them, BT reports.
Footage shows the gunman slinging a huge rifle over his shoulder as he paces back and forth in the Field's Mall shopping centre.
An onlooker filmed the attacker from about 100m away as the man, wearing shorts and a vest, appears to wait for his victims.
A statement from Harry Styles concert promoter Live Nation said: "Tonight's concert with Harry Styles has been cancelled by direction of the Danish Police.
"We are all truly devastated by the events of today and our thoughts are with the victims and their families.
"We are looking into future possibilities for the show, and hope to be able to give ticket buyers direct information as soon as possible."
In a tweet, Styles said he was "heartbroken" and "devastated for the victims".
"I'm heartbroken along with the people of Copenhagen," he said. "I adore this city. The people are so warm and full of love.
"I'm devastated for the victims, their families, and everyone hurting.
"I'm sorry we couldn't be together. Please look after each other. H."
Large crowds had already gathered inside the arena when the show's cancellation was announced and they were asked to leave.
There is no indication the shooting is linked to Styles' planned concert.
Danish tabloid BT published unverified video footage it said was shot by a witness to the attack, Mahdi Al-wazni, showing a man with a large rifle walking through the mall and swinging it around his shoulders.
"He seemed very aggressive and shouted different things," Al-wazni told BT.
Footage published by tabloid Ekstra Bladet showed one person being carried by rescue workers into an ambulance on a stretcher.
"People first thought it was a thief... Then I suddenly hear shots and threw myself behind the counter inside the store," an eyewitness, Rikke Levandovski, told broadcaster TV2.
"He is just shooting into the crowd, not up in the ceiling or into the floor," she added.
The multi-storey shopping mall is located around 5 kilometres (3 miles) south of downtown Copenhagen.
Following the shooting, the Danish royal palace announced it had cancelled a reception with Crown Prince Frederik connected to the Tour de France.
The reception was due to be held on the royal yacht that is moored in Sonderborg, the town where the third stage of the race ended this year.
The incident rocked Denmark at the end of a week in which it hosted the first three stages of the Tour de France cycle race and hundreds of thousands of cheering Danes took to the streets across the country.
Danish gun laws are strict and all weapons, with the exception of some hunting rifles, require a licence issued by the police. The type of weapons used by the suspect had been legal, police said, but the shooter did not have a licence to use them.
Denmark's largest cinema operator Nordisk Film, which has a venue at the Field's shopping centre, said it had decided to close its theaters across the country on Monday due to the shooting.
