Officials say the breadth of topics addressed in the documents, which touch on the war in Ukraine, China, the Middle East and Africa, suggest they may have been leaked by an American rather than an ally.
“The focus now is on this being a U.S. leak, as many of the documents were only in U.S. hands,” Michael Mulroy, a former senior Pentagon official, told Reuters in an interview.
U.S. officials said the investigation is in its early stages and those running it have not ruled out the possibility that pro-Russian elements were behind the leak, which is seen as one of the most serious security breaches since more than 700,000 documents, videos and diplomatic cables appeared on the WikiLeaks website in 2013.
The Russian embassy in Washington and the Kremlin did not respond to requests for comment.
Following disclosure of the leak, Reuters has reviewed more than 50 documents labeled “Secret” and “Top Secret” that first appeared last month on social…
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