Israel-Gaza-Lebanon updates: Nasrallah killed for tying Hezbollah cause to Gaza war

Israeli Foreign Minister Israel Katz declared on social media on Thursday that there "will be no ceasefire in the north," as U.S.-led efforts to prevent a full-scale Israeli invasion of Lebanon appeared to fall flat.

"We will continue to fight against the terrorist organization Hezbollah with all our might until victory and the safe return of the residents of the north to their homes," Katz wrote in a post to X.

The statement came shortly after Prime Minister Benjamin Netanyahu dismissed reports that the U.S. was gathering international support for a 21-day cease-fire. President Joe Biden said on Wednesday the plan had "significant" backing.

"This is an American-French proposal, to which the prime minister did not even respond," a post to Netanyahu's official X page said.

The Israel Defense Forces continued its bombardment of southern and eastern Lebanon overnight into Thursday while its troops prepared for an expected ground operation.

Lt. Gen. Herzi Halevi, the chief of the IDF General Staff, told units at the northern border on Wednesday: "We are preparing the process of a maneuver, which means your military boots, your maneuvering boots, will enter enemy territory."

-ABC News' Jordana Miller and David Brennan

At least 23 more people were killed as Israeli warplanes continued airstrikes in Lebanon through Thursday morning.

The Israel Defense Forces said its aircraft struck approximately 75 Hezbollah targets in the south of the country and the eastern Bekaa region overnight. The force said it is continuing operations "to dismantle and degrade Hezbollah's capabilities."

Since Monday, Israel's intensified air campaign killed nearly 700 people and wounded more than 1,700 others, per data from the Lebanese Ministry of Public Health.

The IDF said Hezbollah fired approximately 45 projectiles into Israel from Lebanon on Thursday morning, some of which were intercepted with the rest falling in open areas.

Prime Minister Benjamin Netanyahu, meanwhile, dismissed hopes of a U.S.-brokered cease-fire that would forestall Israel's planned ground invasion of southern Lebanon.

Netanyahu "instructed the IDF to continue the fighting with full force and according to the plans presented to him," according to a statement published on his official X page on Thursday.

-ABC News' Jordana Miller and Joe Simonetti

Israeli Prime Minister Benjamin Netanyahu said news about a potential cease-fire deal between Hezbollah and Israel being discussed is "incorrect."

"This is an American-French proposal, to which the prime minister did not even respond," he said in a statement posted on social media on Thursday.

He added, "The news about the supposed directive to moderate the fighting in the north is also the opposite of the truth. The Prime Minister instructed the IDF to continue the fighting with full force, and according to the plans presented to him. Also, the fighting in Gaza will continue until all the goals of the war are achieved."

-ABC News' Joe Simonetti and Kevin Shalvey

President Joe Biden told reporters outside the White House on Wednesday night that the U.S. was "able to generate significant support from Europe, as well as the Arab nations" for a 21-day cease-fire between Israel and Hezbollah to head off a full-scale war in Lebanon.

"It's important this war not widen," the president said. "I'll have more to say about it tomorrow."

In a call with reporters just before the president landed, senior administration officials described the proposal as a "breakthrough" they hoped would produce momentum in Lebanon and in stalled talks between Israel and Hamas in the Gaza Strip

"This is an important breakthrough on the Lebanon side, given all that has gone on there, particularly over the last few weeks," a senior administration official said. "But you know, we will try to use the space that provides wisely on all on all fronts."

The officials indicated that a response is expected over the next several hours.

"I guess the parties are going to respond for themselves to the call, but I can share that we have had this conversation with the parties and felt this was the right moment, based on the call, based on our discussion, they are familiar with the text and again, we'll let them speak to their actions of accepting the deal in the coming hours," a senior administration official said.

Officials said they'd been negotiating with Lebanon nonstop for the past 48 hours, and that its leaders there were aware they speak for "everything that happens on that side of the border," indicating that they will accept the deal on behalf of Hezbollah.

"So our expectation is when the government of Lebanon or when the government of Israel both accept this, this will carry and be implemented as a ceasefire on both sides, on both sides of the blue line, for the period of the 21 days," an official said.

-ABC News Cheyenne Haslett