The alleged stalker had come to the attention of police after making threats against the singer and her boyfriend Travis Kelce on social media, the statement said.

“As initial investigations could not completely rule out the possibility of danger, the suspect was identified and taken into custody at the admission control before the concert, for which he had a ticket,” the police said.

American football star Kelce has attended several concerts during the Eras Tour and was in the arena at Gelsenkirchen on Wednesday night.

The suspect will be detained until Saturday, the police said, adding that there had been no danger to Swift or her fans.

Around 60,000 people attended the first of three sold-out Eras Tour concerts in Gelsenkirchen on Wednesday.

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Swift and her entourage will also stop off in Hamburg and Munich before next heading to Poland and Austria.

The Eras Tour began its European leg at the La Defense Arena in Paris in May after first working its way across North and South America and Asia starting in March 2023.

By the end of the year, it had already become the first tour to sell more than $1 billion in tickets and is on track to more than double that by the time it concludes in Vancouver this December.