Intercepted communications between senior al-Qaida operatives apparently prompted the U.S. government to issue a global travel warning, according to the New York Times, which says terrorists discussed attacks against sites in the Middle East and North Africa.
The State Department travel alert is in effect for the rest of the month.
Anyone traveling is urged to pay attention to their surroundings, especially when using public transportation and visiting tourist spots.
Travelers NY1 spoke with at Kennedy airport took the alert in stride.
"There's so many things in place that check and double check, and re-check, and I think not only in New York but in all airports around the world," said one person.
"We hear these types of threats all the time," said another. "I guess the government has to take them seriously. I just hope for the best."
"I've traveled a lot around the world, and I think there are possible threats any time, anywhere in the world," said a third.
The alert came a day after it was announced several American embassies in the Middle East will be closed Sunday, and some may not reopen for several days.