Photographer Glen Friedman says Zack de la Rocha has a torn ACL. In an Instagram post over the weekend, Friedman wrote, “I went to see my good friend Zack (with his torn ACL) perform last night at Madison Square Garden, one of the most hallowed venues in the modern world.”

There has been no official word from the band, but this would explain their recently canceled European tour dates allowing Zack time to heal.