Documents purporting to show classified U.S. intelligence-gathering on Israel's preparations for a possible retaliatory strike against Iran appeared on social media platforms late last week.

The impact of the circulation of these documents on current and future planning by the Israeli military is unclear at this time.

U.S. officials declined to comment on the situation when reached by ABC News. However, a law enforcement source on Sunday confirmed with ABC News that there is an investigation underway.

Markings on the documents indicate that they would have originated from the National Geospatial-Intelligence Agency, which collects, analyzes and distributes intelligence gleaned from satellite and aerial imagery.

If the documents are authentic, it would indicate a major intelligence breach.

According to Mick Mulroy, an ABC News national security and defense contributor, who served as the deputy assistant secretary of defense for the Middle East: "The future coordination between the U.S. and Israel could be challenged, as well."

The Department of Defense, Federal Bureau of Investigation and a spokesperson for the Office of the Director of National Intelligence all declined to comment when contacted by ABC News.

House Speaker Mike Johnson appeared on CNN Sunday and acknowledged that there is an investigation underway into the possible intelligence leak, adding, "We're following it closely."

-ABC News' T. Michelle Murphy

The Israel Defense Forces announced it was targeting infrastructure Sunday night in Lebanon that has been linked to the Al-Qard Al-Hassan Association, an organization it alleges is involved in financing Hezbollah.

The United States placed sanctions on the Al-Qard Al-Hassan Association in May 2021 related to financing Hezbollah activities.

The Al-Qard Al-Hassan group has 31 branches in Lebanon -- including in Beirut and Bekaa, officials said. At least one strike was reported Sunday evening in the Chyah neighborhood of Beirut.

"The 'Al-Qard Al-Hassan Association' is involved in financing the terrorist activities of the Hezbollah organization against Israel, and therefore the IDF has decided to attack this terrorist infrastructure," the IDF said in a statement Sunday. "The IDF continues to work forcefully to destroy Hezbollah's terrorist infrastructure. Therefore, we call on people inside buildings used by Hezbollah to stay at least 500 meters away from them for the next few hours."

-ABC News' Victoria Beaule

The IDF has announced the death of a colonel, 41-year-old Ehsan Daxa, in fighting in northern Gaza on Sunday.

Daxa is one of the highest-ranking IDF officers to be killed in the war. He commanded the 401st "Iron Tracks" Brigade of the 162nd Division, the IDF said.

-ABC News' Jordana Miller

At least 160 rockets fired by Hezbollah crossed from Lebanon into Israel on Sunday, Israel Defense Forces said, as sirens sounded across northwest Israel, including Haifa, the country's third largest city.

The IDF said the barrage of rockets occurred around 3 p.m. local time and that 30 projectiles crossed into Israel three minutes after they were launched.

No injuries or casualties have been reported. The IDF said some projectiles fell in the north and fire services were working to extinguish the fires that erupted from the attack.

-ABC News' Jordana Miller

Emad Abu Tai'ma, a 20-year-old Gazan soccer player, was killed alongside nine members of his family, after a strike hit a house in Bani Sahalia where the family was sheltering early Tuesday morning, according to local health officials.

It took rescuers over two hours to free Abu Tai'ma's body from the rubble, a Gaza Ministry of Health spokesperson told ABC News.

Abu Tai'ma was a soccer player for the Khan Yunis-Tokyo Union for about a year before he was killed, his friend, 19-year-old Mohammed Ibrahim Al-Muzain, told ABC News.

"We studied together in one of the Bani Suhaila schools east of Khan Younis. Imad was a smart student, and he was a famous player even in school. I have not seen him for eight months due to the repeated and continuous displacement. I feel very sad for his loss. He was displaced in a house belonging to the Baraka family, and he is a civilian," Al-Muzain said.

The Palestinian Football Association confirmed Emad's death and reflected on his soccer career playing for Ittihad Khan Yunis Club and the Palestinian national soccer team.

"With the passing of Abu Taima, the number of martyrs of the Palestinian sports and scouting movement, as a result of the ongoing Israeli aggression since October 7, has risen to 455 martyrs, including 314 in football (87 children, 227 young men), in addition to 90 martyrs from the Olympic sports federations, and 50 martyrs from the scouting movement. The occupation forces also destroyed 57 sports facilities in the West Bank and Gaza Strip," the association said in a statement.

-ABC News' Dia Ostaaz