Highly classified military and intelligence documents that appeared online, with details ranging from Ukraine's air defenses to Israel's Mossad spy agency, have U.S. officials scrambling to identify the leak's source, with some Western security experts and U.S. officials saying they suspected it could be someone from the United States.
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 were 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, said in an interview.