U.S. NSA records all calls in targeted foreign nation - report

A National Security Agency (NSA) data gathering facility is seen in Bluffdale, about 25 miles (40 kms) south of Salt Lake City, Utah, December 17, 2013. REUTERS/Jim Urquhart

WASHINGTON (Reuters) - The U.S. National Security Agency has created a surveillance system that is recording all the phone calls in an undisclosed foreign country, allowing it to play back any conversation up to 30 days later, the Washington Post reported on Tuesday.

The newspaper cited unnamed sources with direct knowledge of the system as well as documents supplied by former NSA contractor Edward Snowden, who since last year has leaked extensive data revealing sweeping American spying activities.