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WASHINGTON -- The National Security Agency has broken privacy rules or overstepped its legal authority thousands of times each year since Congress granted the agency broad new powers in 2008, The Washington Post reported Thursday.

Most of the infractions involve unauthorized surveillance of Americans or foreign intelligence targets in the United States, both of which are restricted by law and executive order.

They range from significant violations of law to typographical errors that resulted in unintended interception of U.S. emails and telephone calls, the Post said, citing an internal audit and other top-secret documents provided it earlier this summer from NSA leaker Edward Snowden, a former systems analyst with the agency.