Homeland Security Boost Presence at Domestic Airports

ABC News' Martha Raddatz examines how the foreign threat is affecting travel at home.
2:10 | 08/04/13

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Transcript for Homeland Security Boost Presence at Domestic Airports
Abc news learned homeland official officials are boosting presence at airports and train stations. And looking harder at visitors coming in from overseas of let's go to martha raddatz in washington where she's filling in for george on "this week" this morning. Martha, we have beefed up security, both here in the u.S. And overseas. Should we read into in that american officials think there's a truly imminent threat here or is this really out of an abundance of caution. It is out of an abundance of caution but it is also a very real and very serious threat. As nick said it comes out of yemen. Yemen is such a dangerous place and if you look at the history of yemen, that's where the underwear, the so-called underwear bomber came from and tried to get that bomb on a plane to go off. That's what they're worried about. That's why the domestic threat and the domestic warnings because they don't know whether this will be on an airplane, an air base, an embassy, a consulate, they don't know so they want to be very cautious about this. What they do know is that they have these intercepts and the terrorists in yemen have said it will be a significant strike, a strategically significant strike and it will be, quote, big. And, martha, this unprecedented move on shutting down these embassies, how effective will it be and how vulnerable are americans currently in those countries? Well, I think they're being closed down, number one, in reaction to benghazi but also when you know the target of these people is a strategically significant place you want to close down your embassies. That's -- there's nothing more strategic in those regions in those areas than the embassies and consulates. Some of those embassies are enormous much the embassy in baghdad is absolutely enormous. Billions of dollars spent on security there. Some aren't. In yemen, it's an older embassy, so there are always, always vulnerabilities even in those big ones because those are closing down too. Tense situation for americans all over the world this morning. Martha, thank you and martha, by

This transcript has been automatically generated and may not be 100% accurate.

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