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Parts of the world. they're most likely talking to those individuals to find out what's the security structure at those airports overseas to try and determine are there any soft points. >> rene marsh, thank you so much. let's go on the ground now to egypt, cnn's ian lee is live from sharm el sheikh. a number of airlines are banning flights to and from the airport where you are. what is security there like now? >> reporter: well, jake, security is really tight here. and coming in here earlier this morning i've been in and out of this airport a number of times. i was surprised how tight it was. ...

There is little oversight to make sure the rules are followed. >> the tsa will be driven by intelligence that comes out of the investigation. how if it is an explosive device, how was it put on board the aircraft? it smuggled? it an insider threat? it a passenger? >> reporter: if this was a bomb on board how and when it happened will inform tsa's decision how to enhance security if need be. conversations are on going behind the scenes with tsa at this point. so what else is happening behind the scenes is that tsa is talking with many embassies in different regions to find out what the security...

Sure people stay safe and make sure that you don't overlook the kinds of things that might otherwise be overlooked in a more secure environment. >> what has changed, if you could, sir, on these military bases in the wake of some of these horrific attacks, as we saw at ft. hood as we saw here in 2013. what has changed just internally in terms of the security structure, who can be armed, who can't be armed, what you're walking through, what kind of detectors going into the buildings? >> well it's sad, poppy, in a way truthfully. i'm going to go back before 2013 with what happened at the washingt...

Any hacks that happen in retaliation. >> andrew, could you categorize how vulnerable the u.s. is and are government networks as vulnerable as private networks to hacking? >> the first answer here, i think this is the first private sector hack remotely on the scale of the snowden theft of u.s. information. that was done by an insider threat leaking information but i think it opens this up. the private sector concerns that the u.s. government has been looking at for a number of years now. in terms of defending against these, any successful defense is going to require public and private partnersh...

Governments? >> we need each other but if you're the yemeni government, what will you say? you will save face, of course we can keep the americans safe. they don't have to leave. they're almost in a position they have to say that. >> is there a contrast to what's going on? >> the safety of the diplomats and u.s. citizens within the country is absolutely paramount. i think sensitivities are heightened because of what happened in benghazi, the first point. the second point, yemen's security structure is very very fragile. you have three tiers, the political side. yemeni went for a revolution in ...