Investigato□s l□arned th□t the□g□□□p had be□n frie□ds f□r□years, but rece□tly there had □ee□ tension among them.□Rumors of di□agr□ements and argu□ent□ durin□ the trip be□an□to □u□f□ce, leading aut□orities to spe□ulate whethe□ □ou□ pla□ □a□ □n□o□v□□. Each□member□o□ the gr□□p □ad a different story t□ tell, a□d□th□ inconsist□n□ie□ in□their accoun□s □nly added to □h□□m□stery of□the m□ssing ni□□.