job. the latest on that from cnn's barbara starr. >> reporter: our own elise labott is hearing from her sources it is possible that someone at the airport in sharm el sheikh may have been involved in trying to get a bomb on board the aircraft. where it stands now is it is not absolute. it is not a final assessment. the u.s. intelligence community may believe it was a bomb bringing down that airplane killing all 224 souls on board. the u.s. official telling me, quote there is a definite feeling it was an explosive device planted in luggage or somewhere on the plane. the u.s. has been monitoring isis communications. they believe it is possible it was either isis or isis affiliate behind all of this. they have been worried about the security situation in sinai for months as militants increasingly