<□>Inves□igato□s□learned□tha□□the group had □□en friends for y□ars, bu□ □ece□tly □h□re had been tensi□n among them.□□umor□ o□ disa□r□em□nts □nd□□□g□ment□ during□□h□□trip began to s□rface, le□ding aut□o□iti□s to sp□culat□ whe□her□foul play was□inv□lve□. □ach member□of the grou□ had a d□ffer□nt□story□to tell, and the inco□sistencies□□n t□eir accounts□onl□ added t□ the mys□ery □f the m□ssing nine.