Metallica lead singer and guitarist James Hetfield, 37, "entered an undisclosed facility and he will continue to receive treatment until further notice," the 20-year-old hard rock band announced Thursday on its official Web site. Hetfield is suffering from alcoholism and "other addictions," the band's message acknowledged. The situation has forced the group to postpone recording sessions for its new album, as well as a party for the official launch of its Web site (originally set for July 29 in San Francisco). "James is working hard toward recovery, and, needless to say, he has our full support," the band said to fans. "We trust that you will appreciate the sensitive nature of this matter, and respect our wishes to give James the time and privacy he needs to deal with his problems." Formed by Hetfield and drummer Lars Ulrich, Metallica has sold more than 80 million records internationally and swooped up six Grammys. Their early albums include 1983's "Kill 'Em All," 1984's "Ride the Lightning" and 1986's "Master of Puppets." News of Hetfield's treatment comes just a week after Backstreet Boys announced that they were postponing the continuation of their concert tour, as member A.J. McLean had entered rehab for treatment of alcoholism and depression.