Secretary of State Marco Rubio spoke with Lebanese President Joseph Aoun and Israeli Prime Minister Benjamin Netanyahu regarding ongoing negotiations between the two countries, a U.S. official told ABC News, and as Israel expanded its offensive against the Iran-backed Hezbollah militia in southern Lebanon.

The U.S., the official said, proposed that Israel would refrain from escalation in the Lebanese capital Beirut in exchange for Hezbollah's halt of all attacks on Israel. That step, the official said, "would create space for gradual de-escalation and an effective cessation of hostilities."

Aoun "tried to advance this proposal and secure an agreement," the U.S. official said, but was stymied by Lebanese Parliament Speaker Nabih Berri -- the head of the Shiite Amal Movement and a longtime political ally of Hezbollah.

The official described Berri's response as "evasive and disappointing," and "placed the burden on Israel to stop shooting first."

"Hezbollah is following Tehran's lead. It clearly has no interest in the welfare of the Lebanese people. Iran wants to prolong the conflict in Lebanon so it can claim credit for 'saving the day,'" the U.S. official said.

"The United States does not expect Israel to absorb ongoing attacks on its civilians by a terrorist organization. The fastest way to de-escalate and protect civilians on all sides is for Hezbollah to stop firing immediately," the official added.

-ABC News' Shannon K. Kingston

The Islamic Revolutionary Guard Corps said on Monday that it launched a retaliatory attack on an unnamed air base following U.S. strikes on the Iranian island of Sirik in the Hormozgan region, which sits along the Strait of Hormuz.

"Following the aggression of the U.S. military against a telecommunications tower on Sirik Island, located in Hormozgan Province, an hour ago, IRGC Aerospace Force fighters targeted the air base from which the aggression originated, and the predicted targets were destroyed," the IRGC said in a statement carried by the semi-official Fars News Agency.

"If the aggression is repeated, the response will be completely different, and the responsibility lies with the aggressor and child-killing American regime," the IRGC said.

-ABC News' Will Gretsky

U.S. Central Command announced it had conducted "self-defense" strikes over the weekend, targeting Iranian radar and drone command and control sites in Goruk and Qeshm Island.

CENTCOM said a post on X that the strikes were conducted in response to aggressive Iranian actions, including the shootdown of a U.S. MQ-1 "Predator" drone. The U.S. responded with fighter aircraft, striking Iranian military assets, according to the post.

CENTCOM said that no U.S. servicemembers were harmed in the strikes.

Lebanon’s Ministry of Public Health says the death toll from Israel’s military campaign has risen to 3,412 people, with another 10,269 injured.

In a statement released Sunday, the health ministry also said 127 healthcare workers are among those killed since March 2.

Lebanese Prime Minister Nawaf Salam on Saturday accused Israel of adopting a "scorched-earth policy" in its campaign against Hezbollah. Hezbollah, meanwhile, continues its attacks on Israeli soldiers deployed in the south of Lebanon and its long-range strikes on northern Israel.

-ABC News' Ghazi Balkiz