The Syrian suicide bomber who injured 15 people in a Sunday night attack on a music festival in Ansbach, Germany, left behind a video pledging allegiance to ISIS leader Abu Bakr al-Baghdadi, Bavarian Interior Minister Joachim Herrmann said Monday.br "I think that after this video there's no doubt that the attack was a terrorist attack with an Islamist background."br Islamic State claimed responsibility for the attack according to Amaq, a news agency that supports Islamic State.