Print edition page-A1 sub-headlines:
Militants Alter Tactic; Disclosure Caused More Damage Than Vast Snowden Trove

By Eric Schmitt & Michael S. Schmidt, New York Times, Sept. 29/30, 2013

[....] The communication intercepts between Mr. Zawahri and Mr. Wuhayshi revealed what American intelligence officials and lawmakers have described as one of the most serious plots against American and other Western interests since the attacks on Sept. 11, 2001. It prompted the closing of 19 United States Embassies and consulates for a week, when the authorities ultimately concluded that the plot focused on the embassy in Yemen.

McClatchy Newspapers first reported on the conversations between Mr. Zawahri and Mr. Wuhayshi on Aug. 4. Two days before that, The New York Times agreed to withhold the identities of the Qaeda leaders after senior American intelligence officials said the information could jeopardize their operations. After the government became aware of the McClatchy article, it dropped its objections to The Times’s publishing the same information, and the newspaper did so on Aug. 5. [....]

American counterterrorism officials say they believe the disclosure about the Qaeda plot has had a significant impact because it was a specific event that signaled to terrorists that a main communication network that the group’s leaders were using was being monitored. The sharpest decline in messaging has been among the Qaeda operatives in Yemen, officials said. The disclosures from Mr. Snowden have not had such specificity about terrorist communications networks that the government is monitoring, they said [....]