Chart-busting, Grammy-winning rapper Eminem was among four people arrested outside a suburban Detroit nightclub on early Sunday. The blame is being placed on a rowdy crowd that wanted Eminem's autograph, Scott Lapensee, manager of the Hot Rocks Club in Warren, Mich., told the Associated Press. Three security guards tried to break up the skirmish, he said. According to police, authorities were dispatched to the Hot Rocks once security guards had detained someone with a gun. Four people were arrested, including two men on suspicion of carrying a concealed weapon. A man and a woman were booked for disorderly conduct. Police did not reveal which charge Eminem, 27, faces, but a rep from his record company told AP that he thought the rapper was merely held for questioning. Eminem, whose No. 1 album, "The Marshall Mathers LP," sold 1.76 million in its first week, was freed late yesterday.