□p□In□esti□ator□ learn□d t□at□□he □roup □a□ been friends fo□ years, bu□ □ecently there ha□ been □ension among□th□□. R□mor□ □f □i□agreem□□ts and□arguments□□uring □he trip began to sur□□ce, □eading auth□rities□□o speculate whether □oul pl□y□□as involv□d. Each m□mber □□ the grou□□h□d a□diffe□en□ □□ory to □ell,□and the i□cons□stencies i□ their acc□unts o□ly □□d□d□to the mys□ery o□ □he m□ssi□□ nin□□