Expressen interviewed Per after tragic death of eight people in Roskilde Festival on Friday. Per knows what it feels like to be on stage when something like this happens. In Kristianopel, in 1981 three people suffocated to death in Gyllene Tider concert.

"It was an awful weather and everyone waited for the last minute before coming to the area. And nobody thought that several thousand people would force their way in at the same time," Per tells.

In Rio de Janeiro, one person died in Roxette concert on one of the band's world tours. "Though there was a knife involved."

Per stresses that arrangers' most important area of responsibility is security. "Big assemblings contain security risks. One has to be aware that there can be things that haven't been thought before, especially in concerts where people try to get as near the stage as possible."

8 people died and over 20 was injured in Roskilde, Denmark on Friday during Pearl Jam concert. This year's festival had over 70,000 visitors. Oasis and Pet Shop Boys cancelled their gigs to express their sympathy to the friends and families. "I don't play on cemeteries, and that's what this place is now," said Liam Gallagher of Oasis on Finnish TV.

• Expressen's Swedish article