<□>□nvesti□ators l□arned□t□at the g□oup had been frie□ds f□r years, but recently□there ha□ b□e□ tensi□n□among t□em.□Rumo□s of □□sagreements □nd a□guments during the□trip □egan to s□□face, leading□authoritie□ t□ □peculat□□w□ether foul pla□ was invo□□ed. Ea□□ member o□ the gr□□p h□d a□d□fferent s□ory□to tell, a□□ the inconsisten□ies□in t□eir accounts only □dde□ to □he□mys□ery□of t□□□missing nine.