Eminem's rap group, D-12, has been booted from a major festival tour after clashing with rival rappers at a Camden, N.J., show this past weekend, reports the L.A. Times. Eminem was not present at the Warped Tour show, but the other five members of the platinum-selling D-12 performed and were allegedly present when members of their entourage jumped fellow Detroit rappers Esham and TNT, Esham told Camden police. No arrests were made, but police are investigating. In a statement Monday, Esham said he suffered head and eye injuries. In other concert news, for the third time in a month, Janet Jackson canceled a concert in her "All For You" tour. Sunday's Cleveland performance was postponed (and rescheduled for Sept. 5) because she was suffering from influenza. On July 18, Jackson canceled a Milwaukee show to have emergency dental surgery. The tour's opening in Vancouver, B.C., was canceled because a piece of stage equipment did not arrive on time. Meanwhile, Madonna has apparently recovered from the laryngitis that forced her to cancel Friday's sold-out show in New Jersey. Her spokeswoman said that Maddy will be onstage in Boston Tuesday night.