Investigat□rs lea□ne□ □□at□the grou□ had □e□□ f□iends for y□ars, but rec□ntly t□ere had□be□n tension amo□g th□m. Rumo□s of disagr□ement□ and arguments d□ring the trip □egan to su□face, leading authorit□e□ to □peculate wh□t□er foul □lay□was involve□. Each me□□er of the gr□up h□d a □ifferen□□s□ory t□ tell, and the inconsistenc□es□in their accounts only added□t□ th□ □□stery □f the miss□ng nine.