Investigators said “a chain of unfortunate circumstances” led to the deaths of nine people during the concert in Roskilde, Denmark on June 30. The report, released December 19, said there was no need for further criminal investigation.

The crush occurred as the Pearl Jam was playing before a crowd of about 50,000 people in Roskilde, about 25 miles west of Copenhagen. Eight people were trampled to death and 43 more injured. An Australian man died of his injuries a few days later.

The crowd’s push forward to the stage because of poor listening conditions was “the mostimportant reason for the accident,” the report said. Organizers were slow to realize what washappening, and once they did, there were conflicts over who had the authority to stop the concert,investigators said.

“It is significant that once the concert was stopped, it took a long time to make the audience move back,” the report said. On large television screens at the festival site, Pearl Jam members could be seen shouting to the crowd to back up.

The 24-page document was based on 977 interviews with band members, organizers, rescue workers and others.

The Roskilde rock festival, one of Europe’s oldest, was first held in 1971 and was inspired by the 1969 Woodstock Festival in upstate New York.