A National Security Agency program allows analysts to search through vast databases containing emails, online chats and the browsing histories of millions of individuals, according to whistleblower Edward Snowden.
Officials deny the allegations.
The NSA boasts in training materials that the program, called XKeyscore is its "widest-reaching" system for developing intelligence from the Internet.
XKeyscore provides the technological capability, if not the legal authority, to target even U.S. persons without any foreign person of interest ties, for extensive electronic surveillance.
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