A man who climbed under the roof of the Dortmund stadium during Germany's European Championship round of 16 match on Saturday wearing a mask and carrying a large rucksack only wanted to take photographs, police have said.
A video, published by the website of English newspaper the Daily Mail, shows the man being arrested by police at gunpoint after the match against Denmark.
Officers announced that the man was from the German city of Osnabrück, around 120 kilometres north of Dortmund.
"According to initial findings, the 21-year-old wanted to take photos on the roof of the stadium, as he had already done in other places in Germany," police said in a statement on Sunday.
"He was carrying camera equipment in a rucksack for this purpose. At no time was there any danger to other people in the stadium."
Police did not reveal if he had a ticket or accreditation to enter the stadium, why he was balancing on the beams holding up the roof and why he wore a mask.
A helicopter was used to illuminate the stadium roof as part of the bid to seize him once the majority of fans had left following Germany's 2-0 win.
He got under the roof during the game and both sets of players were informed, the German Football Federation (DFB) confirmed on Sunday.
After a 30-minute suspension due to thunderstorms in the first half, the game continued as normal. Before kick-off for the second half, referee Michael Oliver could be seen talking to captains Ilkay Gündogan und Kasper Schmeichel and looking up.
Spectators and TV viewers assumed they were looking at the sky to see if another thunderstorm was coming but they were actually looking at the roof to see if they could spot the man, after Oliver had been informed by UEFA officials.
It was decided to carry on with the game and the players did not seem distracted.
The incident raises further questions about security at Euro 2024, where fans have already entered the pitch on several occasions without permission.
After iitially referring dpa to police statements, European ruling body UEFA said it will continue to review the security measures in all Euro 2024 stadiums.
It added that the security procedures are constantly reviewed anyway.
UEFA also praised the police and special forces for their professional approach. The excellent cooperation between the associations and authorities was decisive in ensuring that no one was harmed, it said.
