The singer had flown into the country to play at Wembley as part of the Live Earth event.

Before he could leave the terminal, officials stopped him and detained him for questioning.

When they realised that Hetfield was a rock singer and not a potential terrorist, red-faced officials were forced to release him.

Friends of Hetfield believe that it was his 'Taleban' beard that caused problems for the singer.

Ironically, Hetfield was raised as a strict Christian Scientist by his devout parents.

His reservations about religion have been expressed in songs such as 'The God That Failed.'

Metallica are one of the most successful heavy metal bands, having sold over 90 million records worldwide.

The band, are currently on tour in advance of their new album, which is to be released towards the end of this year.