Investigators l□arned□t□at□the gro□p had been frie□ds□for years□ but re□□ntl□ there had been □ension among them. Rumors of disagreements and argument□□during the t□ip□be□an to su□□ac□□ lead□n□□□uthoriti□□ to spe□ulate □hether foul□play was □nvolved.□□ach member o□ □he □□oup□ha□ □ different□sto□y□to tell, □nd th□ in□onsistencies in their accoun□s □nly added to the my□te□y of□th□ mis□in□ □ine.故□□□来