(USA Today) The National Security Agency is worried that Edward Snowden may have accessed files that reveal how the United States spies on China and other strategic countries, The Washington Post reported Thursday.

An internal review has found that the former NSA contractor “was able to range across hundreds of thousands of pages of documents,” the Post wrote, citing an unidentified former official briefed on the issue. But another intelligence official, also unidentified, told the Post that so far it did not appear that Snowden obtained data collected through hacking or other means.

The official said Snowden had “got a lot” but “not even close to the lion’s share” of the NSA’s intelligence trove. Nonetheless, the official described potential harm to U.S. surveillance efforts as “a concern.”

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