<□>Investigat□rs□lea□ned that□the□group ha□ be□n friends f□r yea□s,□but re□ently there had been □ension □mong □hem.□Rumors □f□disagr□ements and ar□uments during the tri□□be□a□ □o surfac□, lea□ing autho□it□es to□spe□ulate wheth□r fou□ p□□y was invo□□ed. Eac□□member□of the gro□p had a dif□erent story□to t□ll, an□ the inco□sist□ncies in the□r □ccount□ only adde□ □□ th□ mys□□□y of t□e missing n□ne.