(CBS News) The terror threat prompting the U.S. government to close nearly two dozen embassies and consulates Sunday is the most specific, credible threat information in years, CBS News senior correspondent John Miller reports.

Intelligence officers have reporting from a reliable source that a major plot is under way and that the team to carry it out has been selected and is in place, Miller reports. The specificity ends there.

What authorities don’t have is the date, the timing or the target of the attack, which is why they have taken such an approach to warning potential targets, Miller reports.

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