CHARLIE SAVAGE nytimes.com
WASHINGTON — The National Security Agency is searching the contents of vast amounts of Americans’ e-mail and text communications into and out of the country, hunting for people who mention information about foreigners under surveillance, according to intelligence officials.
The N.S.A. is not just intercepting the communications of Americans who are in direct contact with foreigners targeted overseas, a practice that government officials have openly acknowledged. It is also casting a far wider net for people who cite information linked to those foreigners, like a little used e-mail address, according to a senior intelligence official.
While it has long been known that the agency conducts extensive computer searches of data it vacuums up overseas, that it is systematically searching — without warrants — through the contents of Americans’ communications that cross the border reveals more about the scale of its secret operations.
It also adds another element to the unfolding debate, provoked by the disclosures of Edward J. Snowden, the former N.S.A. contractor, about whether the agency has infringed on Americans’ privacy as it scoops up e-mails and phone data in its quest to ferret out foreign intelligence.
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