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Terror threat triggers worldwide travel alert

The State Department on Friday issued a worldwide travel alert triggered by an unspecified, but credible terrorist threat, officials said. The alert comes after

The State Department on Friday issued a worldwide travel alert triggered by an unspecified, but credible terrorist threat, officials said. The alert comes after the department's decision to shut down 22 U.S. embassies and consulates Sunday.

The most recent threats are different from the usual, NBC News counter-terrorism analyst Michael Leiter said on Weekends with Alex Witt. 

Leiter says he is “relatively confident that there is one credible source reporting this” and that we “know something is coming, but not where or when.” He said officials become extra focused and create strategies to respond efficiently in the event of an attack.

Although al-Qaida knows the U.S. has intelligence sources to intercept correspondence, “this is a cat and mouse game,” Leiter said.