Huh !! Who was responsible for the Massacre ? Hmm ... I dunno, was not there to witness. From what I gather with the info obtained so far... it was the Prince who went apeshit fueled by the concoction of Drugs and Alcohal. Now there are a lotta conspiracy theories out there floating about. But none of them seem to have facts to back it up. So untill some one finds the holy grail I am sticking to the official storey. There are a lotta circustantial evidence but no solid proof. I think this will be one of those events in history like JFK's assasination. like WHO KILLED JFK ? Nobody knows. On the same page the answer to your question I Don't know for sure.