There have been no such public comments about the other 10 crew members , however . NEW : The search is `` the most difficult in human history , '' Australia 's Abbott says . `` We will not rest until answers are indeed found , '' Malaysian PM says . Australian ambassador : " I am confident that we can find out what happened and bring those responsible to justice. " `` eliminating areas '' Official : All 227 passengers have been cleared of hijacking , psych issues .
NEW : The search is `` the most difficult in human history , '' Australia 's Abbott says . `` We will not rest until answers are indeed found , '' Malaysian PM says . Australian ambassador : " I am confident that we can find out what happened and bring those responsible to justice. " `` eliminating areas '' Official : All 227 passengers have been cleared of hijacking , psych issues .