MAYHEM has been forced to cancel its appearance at this year's Hellfest — set to take place June 23-25 in Clisson, France — after MAYHEM/DIMMU BORGIR drummer Jan Axel von Blomberg (a.k.a. Hellhammer) broke his arm. The injury has made it impossible for him to play the event. Replacing MAYHEM on the festival billing is ENSLAVED. As of now, no US Mayhem dates have been cancelled.