Deryck Whibley Sum 41 has decided to pull out of the Vans Warped Tour while Deryck Whibley recovers from injuries sustained after being attacked in Japan. "Knowing that they are unable to deliver their signature high energy show, Sum 41 made the tough decision that a break is needed while Deryck begins rehabilitation for the slipped disc," the group said in a statement Wednesday.

Three men attacked Whibley in a bar in Japan, where the band was playing the Summer Sonic rock festival, E! Online reported. Last Friday, the band posted an update, saying, "After an MRI scan, it appears Deryck has slipped a disc in his back once again. Despite doctor's instructions, he has decided to play today's show at Summer Sonic regardless."