Israel-Gaza-Lebanon live updates: Hezbollah announces 'escalated' phase of conflict

U.S. Central Command (CENTCOM) chief Gen. Michael Erik Kurilla issued a statement Thursday congratulating the Israel Defense Forces on the killing of Hamas leader Yahya Sinwar.

"U.S. Central Command's support to the Israel Defense Forces remains ironclad," said Kurilla. "Our commitment to countering terrorists throughout the Middle East, with allies and partners, continues to be a top priority. Those who choose the path of terrorism should expect the same fate as Sinwar."

CENTCOM is the combatant command that oversees U.S. missions in the Middle East.

An earlier statement from U.S. Defense Secretary Lloyd Austin called Sinwar’s killing a "major achievement in counterterrorism” and said it provides an opportunity for a lasting cease-fire in the war between Israel and Hamas.

“Our top and most urgent priority is to secure the release of each and every hostage, including our own American citizens," Austin said in a statement. "The hostages should not have to suffer for another hour in the clutches of Hamas and other terrorists. Those who are holding them should release them now."

Hezbollah said Thursday they are transitioning into a "new, escalated phase" in the "confrontation with the Israeli enemy," after Israeli forces and officials announced the death of Hamas leader Yahya Sinwar.

This new phase in the conflict "will be revealed by the developments and events in the coming days," Hezbollah said in the statement.

-ABC News' Josiane Hajj Moussa

The Israel Defense Forces released drone footage they say shows Hamas leader Yahya Sinwar on Wednesday before he was killed.

A damaged building and a man sitting in a chair with his face covered can be seen in the footage.

IDF spokesperson Rear Adm. Daniel said Sinwar was wounded in a shooting and is shown in the footage throwing a wooden plank at the drone.

Israel Prime Minister Benjamin Netanyahu celebrated the killing of Hamas leader Yahya Sinwar by Israeli forces on Thursday, but vowed to continue the war "with all our strength" until the hostages being held by Hamas in Gaza are returned.

"I would like to say again, in the clearest way: Hamas will no longer rule Gaza. This is the beginning of the day after Hamas, and this is an opportunity for you, the residents of Gaza, to finally break free from its tyranny," Netanyahu said in a recorded message.

"The war, my dears, is not over yet. And it is difficult, and it exacts heavy prices from us," Netanyahu said.

Netanyahu said Sinwar was killed when he fled IDF soldiers in a panic on Thursday.

"Now it is clear to everyone, in Israel and in the world, why we insisted on not ending the war. Why did we insist, in the face of all the pressures, to enter Rafah, the fortified stronghold of Hamas where Sinwar and many of the murderers hid," Netanyahu said.

"We are in a war for our existence. Big challenges are still ahead," Netanyahu said.