□□>Inves□igat□rs learned that the gr□□p□□ad been f□□ends for□years, but recent□y there □ad □ee□□tension a□on□ them. □umor□ □f disagr□e□ents a□d argum□n□s□during□the trip be□an□to □□rf□ce, lea□ing a□□horities to □□ecu□□te wh□ther □oul play was invol□ed□ Each□member□of□□he g□oup□had a d□ffe□ent st□ry □o □el□, and the inco□sis□encies in□their accounts only added□to the myste□y □□ □he missi□g n□ne.□>