Metallica have cancelled their tour of Australia and New Zealand after announcing that frontman James Hetfield had returned to rehab.

Messages of support have poured in for the 56-year-old, who has battled addiction and alcoholism for many years.

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His struggle was detailed in the 2004 documentary, Some Kind Of Monster.

A couple of years ago, Hetfield said he had been sober for 15 years.

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