What caused the plane to break up in the air. Moscow dropped its criticism for britain for cancelling its service to sharm el sheikh, and promptly followed suit. President putin cancelled sair flights tairflights to anywhere. In his most recent comment on his crash, are president obama told there was a possible bomb on board but the white house is still not saying what the u. S. Intelligence agencies have learned. We have not made our own determination as to the cause of the incident however we cannot rule anything out including the possibility of terrorist involvement. The u. S. Is joining other countries to take up steps to beef up security, something that would follow an attack as opposed to an accident. Homeland security jeh johnson said would add an additional layer of security to International Air travel. The measures include expanded security screening of items put on commercial jets, airport assessments and offers of security for certain airports. The u. S. Has also offered to