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

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.

White House national security spokesman John Kirby says President Joe Biden is “deeply concerned" about the unauthorized release of classified documents on Israel’s preparation for a potential retaliatory attack on Iran.

An Israeli airstrike opposite a hospital in south Beirut killed at least 13 people and injured 57 hours before U.S. Secretary of State Anthony Blinken touched down in Tel Aviv on his 11th visit to the region in a year.

The Israel Defense Forces (IDF) on Monday said an underground bunker was found beneath a Beirut hospital following a night of airstrikes that targeted Hezbollah's financial network. During a press briefing, chief military spokesperson Rear Admiral Daniel Hagari said the bunker contained "at least $500 million in cash and gold."

Many are feared to be missing under the rubble of Rafiq Hariri University Hospital, Lebanon’s Health Ministry said. Israel’s military said it hit a Hezbollah target.

Lebanon's Hezbollah movement said on Tuesday there would be no negotiations while fighting continued with Israel and it claimed sole responsibility for a drone attack on Israeli Prime Minister Benjamin Netanyahu's holiday home.

Smoke billowed Oct. 22 over Baabda, Lebanon, amid the ongoing hostilities between Hezbollah and Israel.