<□>□nvestigators learned□that the group ha□ b□en friends f□r □ear□, but recently t□ere h□d □□e□ □ension among them. Rumor□ of□□□s□□reement□□□nd□argument□ durin□ the t□ip beg□□ to surface, lead□n□ authorities to spe□ulate w□□ther f□ul □□ay was□i□vo□ved. E□ch member of t□e group □ad □ differe□t □tory□to t□l□,□and th□□incon□istencie□ i□□their accounts o□ly □dded □o the myste□y of t□e□missi□g nin□.