Metallica has offered a $50,000 (£33,300) reward for information leading to the whereabouts of a 20-year-old fan who went missing following the group's concert on 17 October (09).
Morgan Harrington disappeared after the band's Charlottesville gig in Virginia.
Her concerned parents have already offered up a $100,000 (£66,700) reward.
FBI agents have joined the search and Metallica frontman James Hetfield reportedly called the missing student's parents on Friday (23Oct09) to offer the band's support.
Metallica has also posted information about Morgan Harrington's disappearance on its website.