Israeli warplanes struck targets across Gaza overnight and into Sunday, as well as two airports in Syria and a mosque in the occupied West Bank allegedly used by militants, as the two-week-old war with Hamas threatened to spiral into a broader conflict.

Israel has traded fire with Lebanon’s Hezbollah militant group on a near-daily basis since the war began, and tensions are soaring in the Israeli-occupied West Bank, where Israeli forces have battled militants in refugee camps and carried out two airstrikes in recent days.

For days, Israel has seemed to be on the verge of launching a ground offensive in Gaza as part of its response to Hamas’s deadly October 7 rampage.

Tanks and tens of thousands of troops have massed at the border, and Israeli leaders have spoken of an undefined next stage in operations.

Israel repeated its calls for people to leave North Gaza, including by dropping leaflets from the air.

It says an estimated 700,000 have already fled, but hundreds of thousands remain. That would raise the risk of mass civilian casualties in any ground offensive.

Israeli military officials say Hamas’s infrastructure and underground tunnel system are concentrated in Gaza City, and that the next stage of the offensive will include unprecedented force there.

Israel says it wants to crush Hamas, but officials have also spoken of carving out a possible buffer zone to keep Palestinians from approaching the border.

On Saturday, 20 trucks of aid were allowed to enter Gaza from Egypt through the Rafah crossing, the first time anything has gone into the territory since Israel imposed a complete siege two weeks ago.

Aid workers said it was far too little to address the spiralling humanitarian crisis in Gaza, where half the territory’s 2.3 million people have fled their homes.

The UN humanitarian agency, known as OCHA, said the convoy carried about 4 per cent of an average day’s imports before the war and “a fraction of what is needed after 13 days of complete siege”.

The Israeli military said the humanitarian situation was “under control”, as OCHA called for 100 trucks a day to enter.

Hospitals packed with patients and displaced people are running low on medical supplies and fuel for generators, forcing doctors to perform surgeries with sewing needles, using vinegar as disinfectant, and without anaesthesia.

The World Health Organisation says at least 130 premature babies are at “grave risk” because of a shortage of generator fuel. It said seven hospitals in northern Gaza have been forced to shut down due to damage from strikes, lack of power and supplies, or Israeli evacuation orders.

Shortages in critical supplies, including ventilators, are forcing doctors to ration treatment, said Dr Mohammed Qandeel, who works in Khan Younis’ Nasser Hospital.

Dozens of patients continue to arrive and are treated in crowded, darkened corridors, as hospitals preserve electricity for intensive care units and incubators for newborns.

“It’s heartbreaking,” Qandeel told The Associated Press. “Everyday, if we receive 10 severely injured patients we have to manage with maybe three or five ICU beds available.”

Palestinians sheltering in UN-run schools and tent camps are running low on food and drinking dirty water.

A power blackout has crippled water and sanitation systems. OCHA said cases of chicken pox, scabies and diarrhoea are on the rise because of the lack of clean water.

Heavy airstrikes were reported across Gaza, including in the southern part of the coastal strip, where Israel has told civilians to seek refuge.

Israel’s military has said it is striking Hamas members and installations, but does not target civilians. Palestinian militants have fired over 7,000 rockets at Israel, according to the military, and Hamas says it targeted Tel Aviv early on Sunday.

Israeli Prime Minister Benjamin Netanyahu convened his cabinet late on Saturday to discuss the expected ground invasion, Israeli media reported.

A military spokesman, Rear Adm. Daniel Hagari, said Israel planned to step up airstrikes starting Saturday as preparation for the “next stages of the war”.

More than 4,300 people have been killed in Gaza, according to the Hamas-run health ministry. That includes the disputed toll from a hospital explosion.

Syrian state media meanwhile reported that Israeli airstrikes have targeted the international airports in the capital, Damascus, and the northern city of Aleppo.

It said the strikes killed one person and damaged the runways, putting them out of service.

Israel has carried out several strikes in Syria, including on the airports, since the war began.

In Lebanon, Hezbollah said six of its fighters were killed on Saturday, and the group’s deputy leader, Sheikh Naim Kassem, warned that Israel would pay a high price if it starts a ground offensive in the Gaza Strip.

Israel struck Hezbollah targets early Sunday in response to rocket fire, the military said. Israel struck Hezbollah targets early Sunday in response to rocket fire, the military said.