bang could be a number of things. from an explosion to an engine exploding or battery going off. u.s. and u.k. officials shows this is more evidence that this was a bomb put on this plane. behind me at sharm el sheikh, security is incredibly tight. we have that russian team on the ground. they will be going over the procedures. we have seen some planes coming in and taking off and passengers are going to be leaving without their luggage. they have strict restrictions on passengers leaving from the airport. they can only take small carry-on bags. the luggage is taken away in a transport plane. russian officials are at other egyptian airports assessing security. it is not up to the egyptians really to say that security is good enough. it is up to the airlines and countries of origin to determine if it is safe to fly in and out