Though the reason for Black Sabbath drummer Bill Ward's

hospitalization previously had

been unspecified, the band's PR firm, KSA,

confirmed today that

Ward suffered a heart attack on May 19. "He suffered a

minor heart attack, and he's resting nicely and coming along very well," said

spokeswoman Doreen D'Agostino, adding that Ward is still being treated at a

London hospital. Ward's

condition has caused him to miss dates on the band's

first European tour in 20 years. Joining Ozzy Osbourne, Tony

Iommi and Geezer Butler in Ward's place is Vinnie

Appice, who previously toured and recorded with the band. D'Agostino

said Ward likely will join the tour in the fall.