As previously reported, CELTIC FROST abruptly canceled their appearance at Germany's Rock Hard festival yesterday. Mainman/guitarist Tom Gabriel Warrior was whisked away to Switzerland. It can now be confirmed that the matter, while extremely painful, was nothing more than a previously undiagnosed kidney stone. Today (June 4th), Warrior had surgery, back in Zurich, and will reportedly be able to uphold commitments for Sweden Rock festival this coming weekend (8th-10th) in Solvesborg, Sweden.