Smoke billows after an Israeli strike near the southern Lebanese village of Al-Mahmoudiye on September 24, 2024. (RABIH DAHER/AFP via Getty Images)

(NEW YORK) -- Israel is firing strikes into Lebanon as the conflict in the Middle East intensifies.

Israel believes it has eliminated around 30 top Hezbollah leaders over the last several weeks, including Hezbollah leader Hassan Nasrallah, who was killed in an Israeli airstrike in Beirut on Friday, U.S. and Israeli officials said.

Here's how the news is developing:

'Nowhere' Israel cannot reach, Netanyahu warns Iran

Israeli Prime Minister Benjamin Netanyahu appealed to anti-government sentiment in Iran on Monday, telling the Iranian people: "With every passing moment, the regime is bringing you -- the noble Persian people -- closer to the abyss."

"Every day, you see a regime that subjugates you make fiery speeches about defending Lebanon, defending Gaza," the prime minister said in a video statement posted to social media.

"Yet every day, that regime plunges our region deeper into darkness and deeper into war. Every day, their puppets are eliminated."

"Ask Mohammed Deif. Ask [Hassan] Nasrallah," Netanyahu said, referring to the Hamas military commander -- whose death the group has not confirmed -- and the former Hezbollah leader. Israel claims Deif was killed in Gaza in July, while Nasrallah was killed in Beirut on Friday.

"There is nowhere in the Middle East Israel cannot reach," Netanyahu said.

"Iran's tyrants don't care about your future," Netanyahu continued. "When Iran is finally free -- and that moment will come a lot sooner than people think -- everything will be different."

"Our two ancient peoples, the Jewish people and the Persian people, will finally be at peace," Netanyahu said. "The people of Iran should know -- Israel stands with you."

Tehran has not yet responded to Netanyahu's statement. But on Monday, the Iranian Foreign Ministry spokesperson said his country would not deploy volunteer troops to Lebanon in response to Israel's expanding campaign there against Hezbollah.

"We believe that the governments and nations of the region have the necessary ability and authority to defend themselves," he said. "We have not had any request from anyone, and we know that they do not need deployment of human forces from our side."

-ABC News' Joe Simonetti and Somayeh Malekian

Hamas leader in Lebanon killed in airstrike, IDF says

The Israel Defense Forces said Monday it killed Fatah Sharif Abu al-Amine, the head of Hamas' Lebanon branch, in an overnight airstrike.

"Sharif was responsible for coordinating Hamas' terror activities in Lebanon with Hezbollah operatives," the IDF said in a statement.

"He was also responsible for Hamas' efforts in Lebanon to recruit operatives and acquire weapons."

-ABC News' Jordana Miller and Joe Simonetti

Deadly strike hits central Beirut for first time in 18 years

An overnight precision strike on an apartment building in the Cola neighborhood was the first such strike in central Beirut for 18 years.

Four people were killed, including three members of the Popular Front for the Liberation of Palestine militant group.

Israel did not immediately claim the strike but is widely assumed to have carried it out.

-ABC News' Joe Simonetti

Hezbollah deputy gives first statement since Nasrallah assassination

Naim Qassem, Hezbollah's deputy secretary general, addressed followers Monday in the first leadership statement since Hassan Nasrallah was killed in an Israeli airstrike in Beirut on Friday.

"The mujahadeen will continue," Qassem said of the militant group's fighters, their work informed by "what [Nasrallah] designed."

Qassem did not announce a replacement for Nasrallah, but said Hezbollah's next leader will be chosen "sooner rather than later."

Details of Nasrallah's funeral are still unconfirmed. A three-day mourning period in Lebanon began on Monday.

-ABC News' Ghazi Balkiz and Joe Simonetti

IDF confirms new attacks on Hezbollah targets

The Israel Defense Forces said it carried out an operation against more Hezbollah targets early Monday morning local time.

The Israeli Air Force attacked targets in the Bekaa region of Lebanon, the IDF said in a statement.

Targets included launchers and buildings where the IDF said weapons were held.

The Israeli Air Force also attacked what it said were military buildings in southern Lebanon.

-ABC News Will Gretsky

At least 105 people killed Sunday in Lebanon: Ministry of Health

The death toll in Lebanon as a result of Israeli airstrikes Sunday rose to 105, according to the Lebanese Ministry of Health.

Nearly 360 individuals were wounded in the strikes, the ministry reported.

The strikes occurred in southern Lebanon, the Bekaa, Baalbek-Hermel and the southern suburbs of Beirut (Dahieh), according to the ministry.

Netanyahu announces former rival Gideon Sa'ar joined Israeli cabinet

Israeli Prime Minister Benjamin Netanyahu has appointed opposition lawmaker Gideon Sa'ar to rejoin his cabinet, the politicians announced in a joint statement Sunday.

Sa'ar will serve in the Security Cabinet, according to Netanyahu.

"I appreciate the fact that Gideon Sa'ar responded to my request and agreed today to return to the government," Netanyahu said, noting how the leaders have put aside their disagreements.

"We will work together, and I intend to use him in the forums that influence the conduct of the war," Netanyahu added.

Sa'ar was once a member of Netanyahu's Likud Party but defected after an unsuccessful bid for party leadership. He formed his own party in 2020 called New Hope.

"I am joining the government at this stage without a coalition agreement - but with an orderly worldview and with a strong patriotic attitude for our people," Sa'ar said in the joint statement.

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