He called Sinwar a "mass murderer who was responsible for the massacre and atrocities of Oct. 7" - the Hamas-led attack on Israel that unleashed the assault on Gaza.
The head of Israel's military, Lieutenant General Herzi Halevi, said Israel's pursuit of Sinwar over the past year had driven him "to act like a fugitive, causing him to change locations multiple times".
He said soldiers had come on Sinwar during a normal operation and had not known he was there, unlike previous operations against militant leaders based on comprehensive intelligence.
"Here we didn't have that, and your response was very, very strong," he told troops during a visit to the spot where Sinwar was killed.
U.S. President Joe Biden said Sinwar's death marked a moment of relief for Israelis while providing the opportunity for a "day after" in Gaza without the militant group in power. He said he would speak soon with Netanyahu to discuss bringing home Israeli hostages in Gaza and "ending this war once and for all."
Kamala Harris, his vice president and the Democratic nominee in the U.S. presidential election, told reporters: "Justice has been served."
Sinwar, who was
named as Hamas' overall leader following the assassination of political chief Ismail Haniyeh in Tehran in July, was believed to have been hiding in the warren of tunnels Hamas has built under Gaza over the past two decades.
His death could dial up hostilities in the Middle East where the prospect of an even wider
conflict has grown. Israel has launched a ground campaign in Lebanon over the past month and is now planning a
response to an Oct. 1 missile attack carried out by Iran, ally of Hamas and Lebanon's Hezbollah.
But the demise of the man who planned
the attack last year in which fighters killed 1,200 people in Israel and captured more than 250 hostages, according to Israeli tallies, could also help push forward stalled efforts to end the war in which Israel has killed more than 42,000 Palestinians, according to Gaza health authorities.
Israel's Army Radio said the killing had occurred during a ground operation in the city of Rafah in the southern Gaza Strip during which Israeli troops killed three militants and took their bodies.
A ruthless enforcer once tasked with punishing Palestinians suspected of informing for Israel, Sinwar, who was born in 1962, made his name as a prison leader.
He emerged as a street hero in Gaza after serving more than 20 years in an Israeli jail for masterminding the abduction and murder of two Israeli soldiers and four Palestinians. He was freed in 2011 as part of an exchange of more than 1,000 prisoners for one kidnapped Israeli soldier held in Gaza. Sinwar then quickly rose to the top of the Hamas ranks. He was dedicated to eradicating Israel.
In Milan, Italy's foreign minister Antonio Tajani, speaking just before the death was confirmed, told reporters: "I hope that the disappearance of the Hamas leader will lead to a ceasefire in Gaza."
Israel has
killed several commanders of Hamas in Gaza as well as senior figures of Hezbollah in Lebanon, dealing heavy blows to its arch-foes.
The killing raises new questions about the fate of the hostages still in Hamas' captivity. Sinwar was involved in negotiations that could have led to their release.
Families of Israeli hostages said that while the killing of Sinwar was a significant achievement, it would not be complete while hostages are still in Gaza.
"We express deep concern for the fate of the 101 men, women, elderly and children still held captive by Hamas in Gaza. We call on the Israeli government, world leaders, and mediating countries to leverage the military achievement into a diplomatic one by pursuing an immediate agreement for the release of all 101 hostages," the Hostages Families Forum said.
Avi Marciano, the father of Noa Marciano, who was held captive by Hamas and killed in captivity, told Israeli broadcaster KAN: "A year after I hugged Noa for the last time, the monster, the one who took her from me, who had the blood of all our daughters on his hands, finally met the gates of hell. A little justice, but no comfort.
"There will be comfort only when Naama, Liri, Agam, Daniela and Karina, our girls' friends, return home."
In Khan Younis in the south of the Gaza Strip, a displaced Palestinian named Thabet Amour told Reuters that the Palestinian fight would continue.
"This is resistance that does not disappear when men disappear. The assassination of Sinwar will not lead to the end of the resistance or to a compromise or surrender and raising the white flag."
Wassim Akhras, who had also fled his home due to Israeli bombardments, said: "I see that this will not stop the war on Gaza unless the Israeli hostages are returned to their families, that will be a sufficient reason to stop the war.
"I don't think things hinge on Yahya Sinwar, someone will come out following Yahya Sinwar, and Hamas will continue."
Source: Reuters