DEIR-AL-BALAH, Gaza Strip — Israeli strikes killed at least 85 Palestinians across the Gaza Strip overnight and into Thursday, according to local health officials. Hours later, Hamas fired three rockets at Israel without causing casualties, in the first such attack since Israel broke their ceasefire.

Israel resumed heavy strikes across Gaza on Tuesday, shattering the truce that had facilitated the release of more than two dozen hostages and brought relative calm since late January. Israeli bombardments in the past three days have killed at least 592 people, said Zaher al-Waheidi, the head of the records department at the Gaza Health Ministry.

The Israeli military said it was again enforcing a blockade on northern Gaza, including Gaza City. Palestinians were not being ordered to leave northern Gaza but can no longer enter, the military said, and are only allowed to move south on foot using the coastal road. Hundreds of thousands of Palestinians had returned to what remains of their homes in the north during the ceasefire.

Israeli ground forces are also pushing into Gaza near the northern town of Beit Lahiya and the southern border city of Rafah, the military said Thursday. The operations come a day after Israel moved to split Gaza in two by retaking the strategic Netzarim corridor that divides Gaza’s north from south.

Told to evacuate

The military ordered Palestinians to evacuate an area in central Gaza near the city of Khan Younis, saying it would operate there in response to Thursday’s rocket fire from Hamas. The Palestinian militant group said it targeted Tel Aviv. One rocket was intercepted and two fell in open areas, according to the army.

Yemen’s Iran-backed Houthi rebels also launched two missiles at Israel, one early Thursday morning and another in the evening, the military said. Both were intercepted before reaching Israeli airspace, according to the army, and no injuries were reported. Air raid sirens rang out and exploding interceptor rockets were heard in Jerusalem. There have been three such attacks since the United States began a new campaign of airstrikes against the Houthis earlier this week.

A ‘bloody night’

Gaza’s Health Ministry said overnight Israeli strikes killed at least 85 people, mostly women and children. The ministry’s records do not distinguish between civilians and combatants.

The Indonesian Hospital said it received 19 bodies after strikes in Beit Lahiya, near Gaza’s northern border, which was heavily destroyed and largely depopulated earlier in the war.

“It was a bloody night for the people of Beit Lahiya,” said Fares Awad, head of the Health Ministry’s emergency service in northern Gaza, adding that rescuers were still searching the rubble. “The situation is catastrophic.”

Israel’s military said Thursday its airstrikes in Gaza had killed the head of Hamas’ internal security apparatus and two other militant commanders. Israel has said it only targets militants and blames civilian deaths on Hamas because it operates in densely populated areas. A United Nations-backed group of human rights experts accused Israel last week of “disproportionate violence against women and children” during the war in Gaza.

One of the strikes early Thursday hit the Abu Daqa family’s home in Abasan al-Kabira, a village outside Khan Younis near the border with Israel. It was in an area the Israeli military ordered evacuated earlier this week, encompassing most of eastern Gaza.

The strike killed at least 16 people, mostly women and children, according to the nearby European Hospital, which received the dead. Those killed included a father and his seven children, as well as the parents and brother of a month-old baby who survived along with her grandparents.

“Another tough night,” said Hani Awad, who was helping rescuers search for more survivors in the rubble. “The house collapsed over the people’s heads.”