Air strikes in Shejaia, a suburb of Gaza City, killed at least eight Palestinians, according to local emergency services.
There was no immediate comment from the Israeli military and it was not immediately clear who was killed in the attack.
In al-Buriej, in the centre of the strip, the Israeli military said it struck a militant operating in an area from which rockets had been fired into Israel the previous day.
Its Arabic spokesman had ordered people to leave the area before the strike.
The Al-Aqsa Martyrs Hospital said a woman and a child were killed in the strike.
The Israeli government says the Gaza Strip war will end when hostages are freed and Hamas defeated. (AP PHOTO)
"Are you celebrating? Enjoy as we die. For a year and a half, we have been dying," said a man carrying the body of a child in the flashing lights of emergency vehicles.
The Palestinian news agency WAFA said 15 more people were killed in an air strike in Jabalia.
There was no immediate confirmation from Gaza health officials.
A strike in the southern city of Khan Younis killed three people, according to Nasser Hospital and the European Hospital which received the bodies.
Much of the area around the northern towns of Beit Hanoun, Jabalia and Beit Lahiya has been cleared of people and razed, fuelling speculation - which Israel denies - that it intends to keep the area as a buffer zone after the fighting in the Gaza Strip ends.
Israel says its almost three-month-old campaign in the northern Gaza Strip is aimed at preventing Hamas militants from regrouping.
Its instructions to civilians to leave are meant to keep them out of harm's way, the military says.
Palestinian and United Nations officials say no place is safe in the enclave and that evacuation orders worsen the humanitarian conditions of the population.
According to the Palestinian civil defence, more than 1500 tents sheltering displaced people across the Gaza Strip were flooded by heavy rains over the past two days, leaving people exposed to the cold and their belongings damaged.
Israel's campaign in the Gaza Strip has killed more than 45,500 Palestinians, according to health officials in the Hamas-run enclave.
Most of Gaza's 2.3 million people have been displaced and much of the tiny coastal strip is in ruins.
The war was triggered by Hamas' October 7, 2023 attack on Israel, in which 1200 people were killed and another 251 taken hostage, according to Israeli tallies.
US and Arab mediators have spent nearly a year trying to broker a ceasefire and hostage release but those efforts have repeatedly stalled.
Hamas has demanded a lasting truce while Israeli Prime Minister Benjamin Netanyahu has vowed to keep fighting until "total victory".
with AP
