The National Security Agency has been extensively involved in the U.S. government's targeted killing program, collaborating closely with the CIA on drone strikes against targets outside the U.S. alleged to be terrorists, The Washington Post reported after a review of documents provided by former NSA systems analyst Edward Snowden.
The documents make clear that the CIA-operated drone campaign relies heavily on the NSA's ability to vacuum up enormous quantities of e-mail, phone calls and other fragments of signals intelligence, or SIGINT, the newspaper said.
Source: AP. Read full article. (link)