The FBI is leading the investigation, working with Pentagon investigators and the intelligence community, according to US officials briefed on the matter. In recent days, investigators have worked to authenticate the documents and determine who could have had access to them, the officials said. Both documents were widely accessible products, according to two sources familiar with US intelligence. That could provide investigators with a critical jumping-off point: The Defense Department, like other federal agencies, tracks when employees print classified documents. Highlighting the sensitive nature of the leak, American officials were extremely tight-lipped about the investigation on Monday.

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Persons: National Geospatial Intelligence Agency —, John Kirby, Kirby, ”, it’s, Jack Teixeira, Teixeira, CNN’s Natasha Bertrand, Zachary Cohen Organizations: CNN, House, Defense Department, National Security Agency, National Geospatial Intelligence Agency, FBI, Pentagon, The Defense Department, National Security, Department of Defense, East Spectator, US, National Geospatial - Intelligence Agency, Middle East Spectator, U.S . Department of Defense, National Locations: Iran, American, Israel, Australia, Canada, New Zealand, United Kingdom, South Korea, Ukraine