An intercepted message among senior al Qaeda operatives in the last several days raised alarm bells that led to the closing of embassies and consulates Sunday across the Middle East and North Africa, CNN has learned.

CNN has agreed to a request from an Obama administration official not to publish or broadcast additional details because of the sensitivity of the information.

Several U.S. officials also emphasized they have been watching growing threats emerging from Yemen for weeks.

Those threats, combined with the coming end of the month of Ramadan, plus the concern over several major prison breaks in the region, all contributed to the U.S. decision to shut down diplomatic installations.

The shuttering of 22 U.S. embassies and consulates for the day Sunday amid fears of an al Qaeda attack is an unprecedented move.