Harry Styles says he is "devastated" and "heartbroken" following a shooting at a Copenhagen shopping mall that has left three dead and four critically injured.
The former One Direction star had been due to perform at the Royal Arena venue in the south of the Danish capital on Sunday night as part of his Love On Tour shows.
Large crowds had already gathered inside the arena when the show's cancellation was announced, and fans had to be asked to leave.
Harry's message to fans
Styles tweeted to his 37.9 million followers: "I'm heartbroken along with the people of Copenhagen. 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."
The 28-year-old singer signed his tweet, "H".
Live Nation, the promoter of Styles's tour, said in a statement: "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."
Three people were killed and four are in a critical condition following the attack at the Field's shopping centre, according to Danish police.
A 22-year-old man, who has been described as an "ethnic Dane" was arrested near the scene.
So far, officers have said his motives were unclear and that there is nothing to suggest terrorism. They have said he had a history of mental health issues.
The suspect will be arraigned on Monday on preliminary charges of murder.
A reception with the Danish Crown Prince Frederik, due to be held on the royal yacht which is moored in Sonderborg in the south of Denmark, has also been cancelled following the incident.
Pearl Jam and Queen + Adam Lambert are due to perform at the arena in Copenhagen in the coming weeks.
Is Love On Tour cursed?
Styles's shows have faced a number of setbacks. He was due to take his Love On Tour show around the world in 2020 before the pandemic brought the live music industry to a standstill.
His rescheduled tour began in September 2021 in Las Vegas before heading across the US, with the European tour leg kicking off in Glasgow in June 2022.
However, on the first day of the European leg of the tour, a fan fell from the top tier at Glasgow's Ibrox Stadium during the singer's concert, landing on other people in the crowd. No one was seriously injured.
His next show is due to take place in Paris on Tuesday.
His most recent album, Harry's House, was warmly received by critics and lead single As It Was recently claimed its 10th week at number one in the UK.
Styles is currently dating actress and director Olivia Wilde, and stars in her latest film, psychological thriller Don't Worry Darling.