WASHINGTON — President Joe Biden is “deeply concerned” about the unauthorized release of classified documents on Israel’s preparation for a potential retaliatory attack on Iran, a White House spokesman said Monday.

The Biden administration is still not certain whether the classified information was leaked or hacked, White House national security spokesman John Kirby said. Officials don’t have any indication at this point of “additional documents like this finding their way into the public domain,” he said.

Kirby said the Pentagon is investigating. U.S. officials on Saturday confirmed an investigation by the administration.

“We’re deeply concerned, and the president remains deeply concerned about any leakage of classified information into the public domain. That is not supposed to happen, and it’s unacceptable when it does,” Kirby said.

Rescue workers use an end loader Monday to remove rubble of destroyed buildings at the site of an Israeli airstrike that buildings in a southern suburb of Beirut, Lebanon.

The documents are attributed to the National Geospatial-Intelligence Agency and National Security Agency, and note 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,” an intelligence alliance comprised of the U.S., Great Britain, Canada, New Zealand and Australia.

Marked top secret, the documents first appeared online Friday on the Telegram messaging app and quickly spread among Telegram channels popular with Iranians.

Analysts at the SITE Intelligence Group, a consultancy that monitors and analyzes online threats from extremist groups, tracked the release of the documents to a Telegram channel popular with Iran-backed militias.

The channel contained posts from an anonymous user with a long history of posting other allegedly top-secret content who said they had access to the leaked documents. The user also wrote they sold some of the material and provided it to the Iranian military.

The release comes at a pivotal time in the Middle East, as Israel considers its response to Iran’s attack.

“The smallest item — even something like the leak of this relatively innocuous document — could move things in new directions,” said Rita Katz, SITE’s co-founder and executive director.

Flames and smoke rise Sunday form an Israeli airstrike on Dahiyeh, a southern suburb of Beirut, Lebanon.

Meanwhile, Israel said late Monday it planned to carry out more strikes in Lebanon against a Hezbollah-run financial institution that it targeted the night before and which it says uses customers’ deposits to finance attacks against Israel.

At least 15 branches of Al-Qard Al-Hasan were hit late Sunday in the southern neighborhoods of Beirut, across southern Lebanon and in the eastern Bekaa Valley, where Hezbollah has a strong presence. One strike flattened a nine-story building in Beirut with a branch inside it.

The Israeli military issued evacuation warnings ahead of the strikes, and there were no reports of casualties.

Associated Press journalists witnessed strikes late Monday in the coastal region of Ouzai, near Beirut’s airport, and Lebanon’s Health Ministry said an airstrike near Beirut’s largest public hospital killed four, including a child, and wounded 24. It was the first strike on the Lebanese capital in 10 days.

An Israeli soldier waves from a tank Monday near the Israeli-Gaza border in southern Israel.

Israeli ground forces invaded Lebanon this month. The military said it aims to push Hezbollah out of southern Lebanon so tens of thousands of Israelis can return to their homes nearby after more than a year of cross-border rocket and drone attacks. Israeli airstrikes have pounded large areas of Lebanon for weeks, forcing more than a million people to flee their homes.

Hezbollah has been launching rockets into Israel almost every day since Hamas’ deadly raid into Israel last year that sparked the war in Gaza.

The United States hopes to revive diplomatic efforts to resolve both conflicts after the killing of Hamas leader Yahya Sinwar last week, but so far all sides appear to be digging in.

Secretary of State Antony Blinken was scheduled to travel to the Middle East again, making his 11th trip to the region since the war in Gaza erupted last year.

The State Department said Blinken would depart Monday for a weeklong trip to Israel and a number of Arab countries on a visit that also comes as Israel weighs retaliation against Iran for a ballistic missile attack this month. His other stops are likely to include Jordan, Saudi Arabia, Qatar and the United Arab Emirates, officials said.

The trip was expected after Biden said last week he would dispatch Blinken to the region following Israel’s killing of Hamas military chief Yahya Sinwar, a move that some believe could open a window for new talks on a cease-fire proposal that has been languishing for months.

U.S. Secretary of State Anthony Blinken attends a reception Friday for U.S. President Joe Biden in Bellevue Palace, Berlin.

Blinken will meet Prime Minister Benjamin Netanyahu and President Isaac Herzog in Israel on Tuesday, Israeli officials said.

“Secretary Blinken will discuss the importance of bringing the war in Gaza to an end, securing the release of all hostages, and alleviating the suffering of the Palestinian people,” State Department spokesman Matthew Miller said in a statement.

He said Blinken also would underscore the need for a dramatic increase in the amount of humanitarian aid reaching Gaza, something that Blinken and Defense Secretary Lloyd Austin made clear in a letter to Israeli officials last week.

That letter reminded Israel that the Biden administration could be forced by U.S. law to curtail some forms of military aid should the delivery of humanitarian assistance continue to be hindered.


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