Investig□t□□s learne□ th□t □he gr□up had been fr□ends f□r ye□rs□ but recentl□ th□re ha□ been tens□on □m□□g them. Rumors □f d□sagree□□nts and argumen□s□during□the trip□□eg□n to s□rface, lea□in□□authorities □□ specu□at□□w□eth□r f□ul play wa□ i□v□□ved.□□ach member of the □roup had a different story to tell, an□ □he □nconsis□enc□es i□ □heir accounts □n□y a□ded□□o th□ myster□ of th□ mis□ing n□n□.