FBI investigating classified docs leak of US intel on Israel planned strike on Iran

The FBI is investigating the leak of classified documents which included top secret U.S. intelligence on Israel's planned attack on Iran, Fox News Digital confirmed. 

"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 bureau said in a statement. "As this is an ongoing investigation, we have no further comment." 

White House National Security spokesman John Kirby told reporters on Monday that he did not have information on whether the unauthorized release was a result of a hack or an employee leak. 

The documents, which are marked top secret, were posted to the Telegram messaging app last week. 

The documents were attributed to the U.S. Geospatial Intelligence Agency and National Security Agency and noted that Israel was still moving military assets in place to conduct a military strike in response to Iran's blistering ballistic missile attack on Oct. 1. They were sharable within the "Five Eyes," which are the U.S., Great Britain, Canada, New Zealand and Australia.

This is a developing story. Check back for updates. 

The Associated Press contributed to this report.