Terrorist Threat Causes Worldwide Travel Bulletin

The threat from Al Qaeda did not indicate a specific target or even country.
2:06 | 08/03/13

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Transcript for Terrorist Threat Causes Worldwide Travel Bulletin
A serious terror threat is causing a world wild travel ban. How is this affecting the americans looking to fly this weekend? Reena ninan has been looking at this and joins us from washington. Reporter: Good morning, bianna. It's a threat coming from al qaeda's most dangerous affiliate. A group that's tried to attack the u.S. Homeland four times. Using the most innovative and SOPHISTICATED IEDs. It doesn't specify a target or a country, making it all the more worrying for travelers. It's a new travel warning coming at the height of the busy summer travel season. A threat, officials say, comes from al qaeda leadership in yemen. We can say with some measure of confidence that it's al qaeda-linked. Attempting, obviously, to focus its attacks in the united states, u.S. Interests, u.S. Personnel. Reporter: After amman al zawahiri, in a taped message, encourages attacks in the middle east. A worldwide travel alert issued friday, cautions americans traveling abroad, of the potential for terrorists to attack public transportation systems and other tourist inf infrastructure. I feel like they're not telling us the complete truth. A halfway truth. I try to put it behind me. Any of the changes due to flying, it puts you on alert. Vigilance means that you should be always having the extra sense of alertness about you. Reporter: There's simple, common sense measures travelers can take to ease their anxiety. If something looks to a reasonable, prudent person, not to feel comfortable with it, that's good enough to make the phone call. Reporter: And while terrorists have targeted subways and trains in the past, for now, the nypd has no immediate plans to step up security in new york city. I don't have any concerns. You can't live in fear. No. Reporter: And this current global travel alert will stay in effect for the rest of the summer, until the end of august.

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

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