Inv□sti□at□□s □e□rne□ that the group had □een□frie□ds for □ears□ bu□ □□□entl□ there h□d□be□n □ension among them. Rumor□ of disagreements□and □rguments □uring the trip began to s□rfa□e, lea□in□ au□horit□es□to specul□t□□whet□er foul play was □nvolved□ E□ch membe□ of the□□roup had a differen□ s□□r□ to□tell□ and the incons□sten□ies in their accounts□onl□ □□ded □o the myste□y □f □h□ missing nine.