Over 1,000 people in Lebanon have been killed in the last two weeks.
Israel's Lebanon operation continues as leaders consider their response to Iran's long-range attack on Tuesday, in which hundreds of missiles were fired into the country, according to Danny Danon, Israel's ambassador to the United Nations.
Iran said the unprecedented attack was retaliation for a wave of assassinations carried out by Israel over the last several weeks targeting Hezbollah, including leader Hassan Nasrallah.
Most of the missiles were intercepted, but "several hits were identified, and the damage is being assessed," an Israeli security official said.
Tune in to ABC News Live at 4 p.m. and 8:30 p.m. on Monday, Oct. 7, for "Oct 7th: Race to Survive" -- special coverage of the anniversary of the conflict. Veteran correspondent Matt Gutman highlights voices of Israelis and Palestinians impacted by the war and the ongoing humanitarian crisis in Gaza.
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
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
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
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
