caution saying nothing is certain yet. despite america's close intelligence relationship with white house also holding off on saying a bomb destroyed the plane. >> that just is based on the guidance that i've received from our national security professionals including our intelligence professionals about both what we know and what we doeb don't know. at this point we don't have enough information to make our own determination about what exactly occurred. we do have enough information at this point to not rule out the possibility of terrorist involvement. >> ben collin s a u.s. special forces vet who served three tours of duty in afghanistan. tom thurman is an exclosive expert who worked on the bombing on pan am flight. great to have you both here today.