Sylvester Stallone has been detained at Sydney Airport after customs official found "prohibited items" in his luggage.

The actor, travelling to Australia promote his new film Rocky Balboa, was apparently detained for several hours late on Friday after what is rumoured to be body-building prodcuts were discovered.

Whilst Australian Customs Service national investigations manager Richard Janeczko refused to confirm what items caused the incident, he did says, "As a result of having their luggage x-rayed, a number of prohibited items were seized by Customs.

"Mr. Stallone was allowed to continue with his party and our investigations are continuing."