US pop giants The Black Eyed Peas pulled out of the controversial Michael Jackson tribute concert being held in Wales today, dealing another blow to the show’s embattled organisers.

“Due to unavoidable circumstances, the Black Eyed Peas will be unable to perform at Michael Forever event,” said Chris Hunt, head of Global Live Events which is staging the concert.

“It is with regret that we announce the removal of Black Eyed Peas from the Michael Forever bill, but I look forward to a great night with other earth shattering artists,” he added.

The announcement immediately triggered widespread reports that the hip-hop quartet were about to split.

Pop singer Christina Aguilera and Motown legend Smokey Robinson will head today’s line-up at Cardiff’s Millennium Stadium, but the concert has been overshadowed by the trial of Conrad Murray, who is accused of Jackson’s manslaughter. A rift has developed between family members over whether they should attend the concert or remain in Los Angeles for the trial.

The event is the brainchild of brothers Marlon, Tito and Jackie, sister La Toya and mother Katherine but siblings Jermaine, Randy and Janet remain opposed.

Michael Jackson’s three children, Paris, Blanket and Prince, are all expected to attend.

There has also been dispute over where proceeds from the concert will eventually end up.

A portion of the takings will go to the AIDS Project Los Angeles and Prince’s Trust – both charities supported by Michael Jackson – but many fans have been angered by reports that the Jackson family themselves stood to make a profit.

Amid the chaos, ticket sales have reportedly been slow with many areas within the 60,000 capacity venue likely to remain empty.