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

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

Israel launched a preemptive strike on Hezbollah in Lebanon, Israel Defense Forces spokesman Daniel Hagari said in a video on X.

"A short while ago, the IDF identified the Hezbollah terrorist organization preparing to fire missiles and rockets toward Israeli territory," Hagari said.

"In a self-defense act to remove these threats, the IDF is striking terror targets in Lebanon, from which Hezbollah was planning to launch their attacks on Israeli civilians," Hagari continued.

Hamas will not take part in the cease-fire talks scheduled for Sunday, an Egyptian official told ABC News.

U.S., Israeli and Qatari delegations will take part, the source said.

A Hamas delegation traveled to Cairo on Saturday to hear the details of the latest proposal from the mediators, but they will not participate in the talks themselves, Sunday, according to the source.

-ABC News' Ayat Al-Tawy and Victoria Beaulé