Health officials in Gaza reported at least 24 people killed and another 54 wounded on Saturday, including children.
The strikes, which Israel said were in response to gunfire at its troops, came after international momentum on Gaza, with the UN Security Council on Monday approving the US blueprint to secure and govern the territory.
It authorises an international stabilisation force to provide security, approves a transitional authority to be overseen by President Donald Trump and envisions a possible future path to an independent Palestinian state.
Israel has previously carried out similar waves of strikes after reported attacks on its forces during the ceasefire. At least 33 Palestinians were killed over a 12-hour period on Wednesday and Thursday, mostly women and children, health officials said.
One of Saturday's strikes targeted a vehicle, killing 11 and wounding over 20 Palestinians in Gaza City's Rimal neighbourhood, said Rami Mhanna, managing director of Shifa Hospital, where the casualties were taken. The majority of the wounded were children, director Mohamed Abu Selmiya said.
Associated Press video showed children and others inspecting the blackened vehicle, whose top was blown off.
A strike targeting a house near Al-Awda Hospital in central Gaza killed at least three people and wounded 11 others, according to the hospital. It said a strike on a house in Nuseirat camp in central Gaza killed at least seven people including a child and wounded 16 others.
Another strike, targeting a house in Deir al-Balah in central Gaza, killed three people, including a woman, according to Al-Aqsa Hospital.
Israel's military in a statement said it launched attacks against Hamas after an "armed terrorist" crossed into an Israeli-held area and shot at troops in southern Gaza.
It said no soldiers were hurt. The military said the person had used a road on which humanitarian aid enters the territory, and called it an "extreme violation" of the ceasefire.
In other statements, the military said soldiers killed 11 "terrorists" in the Rafah area and detained six others who tried to flee an underground structure. It also said its forces killed two others who crossed into Israeli-held areas in northern Gaza and advanced toward soldiers.
Israeli forces remain in just over half of Gaza after withdrawing from some areas under the ceasefire.
A senior member of Hamas' political bureau, Izzat al-Rishq, in a statement accused Israel of "fabricating pretexts to evade the (ceasefire) agreement and return to the war of extermination" and said Hamas had urged the US and other mediators to compel Israel to implement the agreement.
The Hamas statement didn't comment on the claim by Netanyahu's office of five senior members killed.
