□p>□n□es□ig□tors□learne□ that t□□ grou□ had bee□ friends □o□ years, but □ecently there □ad□been t□nsion among them□ R□mors□□□□□isagre□ments and arg□men□□ dur□ng□t□e □rip□began □o su□face,□□ea□ing a□thorities to speculat□ □hethe□ foul play was invo□ved. E□ch me□□er of the group had □ diff□re□t story to tell, an□ the incon□istencies i□ □heir □ccounts only ad□ed to□t□e mystery□of□the □□ssin□ n□ne.