Australian immigration officials Monday investigated if U.S. rappers D12 were unduly lectured on appropriate behavior before they were let in the country.

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The Detroit rap group discovered by Eminem performed in Melbourne Monday after arriving in Perth Saturday, but were only allowed in after officials told them how they should behave, the Herald Sun repoerted Monday.

Eminem -- who performs with the group -- accused the government of taking Australia back to the dark ages by lecturing his rap crew.

A Department of Immigration spokeswoman said the allegations would be investigated and Immigration Minister Amanda Vanstone had been made aware of the issue.

Each member of the musical group has an alter ego, hence the name the Dirty Dozen, or D12.