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

An apparent U.S. intelligence breach related to Israel’s plans to strike Iran has unsettled the intelligence community and sent the Biden administration scrambling to determine if it came

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.

The Telegram channel involved in the leak identifies itself as being based in Tehran, Iran’s capital. It previously published memes featuring Iran’s Supreme Leader Ayatollah Ali Khamenei and material in support of Tehran’s self-described “Axis of Resistance,” which includes Middle East militant groups armed by the Islamic Republic.

According to the published information, documents classified as "top secret" from October 15 and 16 appeared on the telegram channel Middle East Spectator. On this basis, it was concluded that only the member countries of the Five Eyes Alliance,

The FBI announced Tuesday it was investigating the alleged leak of classified US intelligence documents about Israel's plans for a retaliatory strike on Iran.

The FBI said Tuesday that it is investigating the unauthorized release of classified documents on Israel’s preparation for a potential retaliatory attack on Iran. White House national security spokesman John Kirby said Monday that the Biden administration is still not certain if the classified information was leaked or hacked but that officials don’t have any indication at this point of “additional documents like this finding their way into the public domain.