The FBI is zeroing in on a US government office where it believes the leaked US intelligence documents on Israel’s preparations for a possible attack on Iran were printed, a US official and another source familiar with the matter told CNN.

The reports began circulating online last week, raising concerns the leaker came from within the U.S. government.

The FBI says it's investigating the unauthorized release of classified documents on Israel’s preparation for a potential retaliatory attack on Iran.

Top-secret documents, which surfaced on the Telegram messaging app, contain U.S. intelligence on Israel’s potential plans for a retaliatory attack on Iran.

If Trump wants to have a conversation about the United States sharing highly confidential information from Israel, he might not like where it ends up.

The FBI is investigating the public disclosure of a pair of highly classified intelligence documents describing Israel's preparations for a retaliatory strike on Iran, the bureau said on Tuesday. "The FBI is investigating the alleged leak of classified documents and working closely with our partners in the Department of Defense and Intelligence Community,

The FBI confirmed that the bureau is investigating the unauthorized release of top secret U.S. intelligence on Israel's planned counterattack on Iran.

The FBI says it's investigating the unauthorized release of classified documents on Israel’s preparation for a potential retaliatory attack on Iran.

The FBI and Department of Defense are investigating the publication of two classified documents discussing Israel's preparations to attack Iran and focusing on who might have had access to them.

The documents began circulating on Friday on the Telegram app, and U.S. officials are looking for the original source of the leak.