Israel-Gaza live updates: Sirens sound in Tel Aviv as Hamas fires rocket from Gaza

The Israeli Air Force launched "dozens" of planes to attack locations throughout southern Lebanon, saying it was continuing "to remove threats, to vigorously attack the terrorist organization Hezbollah."

"Israel's air defense systems, navy ships and Air Force planes are on a defense mission above the country's skies, identifying, intercepting threats and attacking wherever in Lebanon it is required in order to remove threats and harm Hezbollah," Israel Defense Forces spokesperson Daniel Hagari said.

The aerial strikes within Lebanon were coming as Israeli defenses were dealing with "different types of threats," including scores of rockets and drones launched into Israeli airspace, he said.

"We have already intercepted a number of rockets and unmanned aerial vehicles that approached the territory of the State of Israel," Hagari said.

He added, "We warn the Lebanese citizens in South Lebanon. We recognize that Hezbollah is firing in a large area near your homes. You are in danger. We attack and remove Hezbollah threats."

-ABC News' Will Gretsky and Kevin Shalvey

Hezbollah claimed early on Sunday to have launched more than 320 rockets toward 11 military locations within Israel and Golan Heights.

The "enemy sites" that had been targeted were detailed in a statement. They included military bases in Meron, Ein Zeytim and Al-Sahl.

Barracks in Naveh Ziv, Ramot Naftali and Zaoura were also among the sites targeted, Hezbollah said.

The group described those launches as a "first stage," saying they were "targeting Israeli barracks and sites to facilitate the passage of offensive drones towards their desired target deep inside" Israel.

-ABC News' Will Gretsky and Kevin Shalvey

President Joe Biden "is closely monitoring events in Israel and Lebanon. He has been engaged with his national security team throughout the evening," White House National Security Council spokesman Sean Savett said.

"At his direction, senior U.S. officials have been communicating continuously with their Israeli counterparts. We will keep supporting Israel’s right to defend itself, and we will keep working for regional stability," Savett said.

ABC News' Anne Flaherty

Tel Aviv Ben Gurion International Airport has temporarily closed Sunday morning, officials said.

"Due to the security situation, the departures this morning from Tel Aviv will be delayed, and will not take off in the next few hours. Flights en route to Israel will be directed to land at alternative airports in the region," Israel Airports Authority said in a statement.

ABC News’ Dana Savir