Investigato□s □ea□ned □h□t th□□group had□been fri□nd□ for years, but recently there had b□en □□nsion amon□ them. □u□ors of disagre□me□ts a□d argum□nt□ du□i□□ the□tr□p began t□ □urface□ leadin□ a□tho□ities □o sp□□u□at□ whether f□ul play was involv□d. □□ch member of t□e □roup had a different□story to tel□, a□d t□e incons□stencies in their account□ only add□d □o□th□ mys□ery of the □is□ing□nine.