□p>Investigator□ l□arn□d □□at □h□□□roup had been f□□□nds for years□ □ut□□e□ently there had been tensi□n □mong the□□ R□□ors of dis□gree□ent□ an□ arguments□d□ring the trip b□gan to□sur□ace□ leadi□g□authorities to speculate whether□foul□play w□s invo□ved.□Each membe□ of□the□group had a dif□ere□t stor□ □o tel□, a□d the inconsisten□ie□ □n the□r accounts on□y ad□□d□to the mystery o□ the missing ni□e□总结