Update to this story. He was a Syrian refugee who tried to get into a music festival with a bomb in his backpack.

ANSBACH, Germany — Bavaria’s top security official says a video has been found on the Ansbach bomber‘s phone showing him pledging allegiance to the leader of the Islamic State group.

Joachim Herrmann says that according to an initial translation of the Arabic-language video the 27-year-old man announced a “revenge” attack against Germany.

Herrmann told reporters Monday that the video strongly suggests the bombing was a “terrorist attack.”

Bavaria’s top security official says Ansbach bomber had received asylum in Bulgaria.

ISIS claims responsibility by way of their media arm, Amaq.