Israel said a drone targeted Prime Minister Benjamin Netanyahu's residence on Saturday, as Hezbollah launched a barrage of projectiles into Israel from its northern neighbour Lebanon.
On the southern front, Israel hammered Gaza with air strikes, with an overnight raid on Jabalia in the north killing 33 people, according to the besieged civil defence agency.
Netanyahu's office said the prime minister and his wife were not at their residence in the central town of Caesarea during the drone attack and there were no injuries.
Earlier, the military said a drone launched from Lebanon had "hit a structure" in Caesarea.
Sirens blared across Israel throughout the morning as Hezbollah fired projectiles from various locations in Lebanon.
The group said it launched a large salvo of advanced rockets at a military base in Israel's Haifa region.
A man in the northern Israeli port city of Acre died after being struck by shrapnel, the Magen David Adom emergency service said, while shrapnel also wounded five people in the Haifa city of Kiryat Ata.
Iranian supreme leader Ayatollah Ali Khamenei, whose country also backs Hamas, said the group "will not end at all with the martyrdom of Sinwar".
As fighting raged in Gaza, civil defence agency spokesman Mahmud Bassal announced "33 deaths and dozens of wounded" in an Israeli strike on the northern area of Jabalia overnight.
The Israeli military said it was "looking into it".
Early on Saturday, three houses in the Jabalia refugee camp were targeted, the civil defence agency said, while witnesses told AFP there was heavy gunfire and shelling in the direction of the camp.
Israeli forces have focused their attacks on northern Gaza, where they say Hamas is regrouping.
Witnesses also reported Israeli shelling in central Gaza's Al-Bureij camp.
Israeli forces, accused of targeting health facilities, were shelling Indonesian Hospital in north Gaza, medics there said.
The violence has dashed hopes Sinwar's death might bring the war closer to an end.
"We always thought that when this moment arrived, the war would end and our lives would return to normal," 21-year-old Gazan Jemaa Abu Mendi said.
"But unfortunately, the reality on the ground is quite the opposite. The war has not stopped, and the killings continue unabated."
Netanyahu said that while Sinwar's killing did not spell the end of the war, it was "the beginning of the end".
US President Joe Biden, along with the leaders of Germany, France and Britain, urged "the immediate necessity to bring the hostages home to their families, for ending the war in Gaza, and ensure humanitarian aid reaches civilians".
In August, Netanyahu called Sinwar "the only obstacle to a hostage deal".
Ayala Metzger, daughter-in-law of killed hostage Yoram Metzger, said with Sinwar dead it was "unacceptable" that hostages remained in captivity.
An Israeli autopsy found Sinwar was initially wounded in the arm by shrapnel, but killed by a gunshot to the head, the New York Times reported. The circumstances of the shot remain unclear.
Hamas sparked the war in Gaza with its October 7 attack last year that resulted in the deaths of 1,206 people, mostly civilians, according to an AFP tally of official Israeli figures.
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