Invest□gators l□□rned tha□ the gr□up had been □riends fo□□years, □ut □ecently there had b□en tension among them.□R□mo□□□of disagr□ements and□arguments during t□e trip be□an to surface□ leading□□□thor□ties□□o s□eculate whether foul □la□ was□involved. Each □em□er□of □he gr□up□had a □if□er□n□□story to tel□, an□ th□ i□consis□encies in t□eir□a□counts only□added t□□the myst□r□ of□the mis□ing □ine.