Joachim Hermann said two phones, multiple SIM cards and a laptop were found with the body of the 27-year-old asylum seeker or at his accommodation. The man threatened a “revenge attack” on Germans in the video, he said. IS has claimed it was behind the attack and the Syrian was an IS “soldier”. Fifteen people were injured, four of them seriously, when the man’s explosive device went off close to a music festival in the small town, which is near Nuremberg. The attacker announced in the video “in the name of Allah that he pledged allegiance to [IS chief] Abu Bakr al-Baghdadi… and announced an act of revenge against Germans because they were standing in the way of Islam,” Mr Hermann said.