Several persons were killed in a shooting incident at a Copenhagen shopping mall on Sunday, according to Danish police. They claimed to have arrested a 22-year-old Danish male and that they could not rule out an “act of terrorism.”

“There are several injured, and what we also know now is that there are several dead,” Chief Police Inspector Soren Thomassen told reporters, adding that police had launched a major search effort in the Zealand region.

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Thomassen refused to speculate on the suspect’s likely motives or if he was known to the police.

There was no proof that more shooters were at the site of the incident, according to investigators.

Field’s, a big multi-story retail mall with stores, restaurants, and parking, is located about 5 kilometres (3 miles) south of central Copenhagen.

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The event occurred across the street from a location where Harry Styles was due to perform as part of his ‘Love on Tour’ on Sunday. Following the event, Styles expressed shock and conveyed prayers and love to his Danish fans. His show, which was scheduled to begin at 8 pm local time, was officially cancelled by the direction of local authorities, although a previous report by the PA agency stated that the concert was to go ahead as scheduled.    

The attack comes on the heels of a horrific shooting in neighbouring Norway last week, in which a lone shooter killed two people in the capital Oslo.

According to the most recent Danish Security and Intelligence Service report, the terrorist threat to Denmark is now classified as “serious,” with “militant Islamism” posing the most significant concern.

The threat posed by right-wing extremists to Denmark is seen as “general,” implying that there is capacity, motive, and possible strategy.

Also read: Harry Styles ‘shocked’ by Copenhagen mall shooting, sends ‘prayers’ and ‘love’

Denmark last witnessed a militant incident in 2015, when a lone shooter shot and killed a man outside a culture centre sponsoring a debate on free speech and then shot and killed another person outside a Jewish synagogue in central Copenhagen.

In a shootout with police, the gunman was killed.