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Gazans searched for loved ones and heard news of family members killed as communications gradually returned to the enclave on Sunday after a near total blackout as Israel's troops pushed into the besieged enclave.

The United Nations also warned that Palestinians were desperate for food and that civil order was breaking down after three weeks of Israeli bombardment and a siege on the densely populated coastal strip.

The fighting intensified on Friday night as Israeli forces waged ground operations in Gaza in what Israeli Prime Minister Benjamin Netanyahu described as the second phase of the war aimed at crushing Hamas.

Shaban Ahmed, a public servant who works as an engineer and has five children, described the Israeli attacks as "doomsday".

"This morning, Sunday, I discovered that my cousin has been killed in an air strike on their house on Friday," Ahmed, who stayed in Gaza City despite an Israeli warning to evacuate south, told Reuters.

"We only knew today. Israel cut us off from the world in order to wipe us out, but we are hearing the sounds of explosions and we are proud the resistance fighters have stopped them at meters distance."

Israel's chief military spokesperson has declined to say whether Israel was behind the telecommunications blackout but said it would do what it needed to protect its forces.

Israeli air strikes have been pounding Gaza City since Hamas' Oct. 7 attack on southern Israel, in which Israeli authorities said at least 1,400 Israelis were killed in the deadliest day of the nation's 75-year history.

Ahmed said the strikes on Friday from air, sea and the ground continued non-stop for hours.

Hamas said on Sunday it was continuing to confront Israeli forces, which were continuing ground operations.

The health ministry in Gaza said on Sunday a total of 8,005 people there had been killed since Oct. 7.

Palestinians were struggling to find loved ones in the bloody chaos as the growing humanitarian crisis squeezed Gaza. One woman looking for one of her sons stood over rubble in Gaza City and cried out: "I don't know where he is."

In another part of Gaza, people looked for survivors after Israeli air strikes in the Al-Nasir neighbourhood. People pulled a body from the rubble as smoke billowed. A woman screamed. Others carried the injured.

Many people have been glued to rusty radios for news, which had become the only means to get information on the heaviest Israeli air strikes ever on narrow Gaza, one of the most densely populated spots in the world, with the internet and phones down.

Medical services became so stretched that ambulances were no longer taking calls. People hit by bombings relied on volunteers to take them for treatment.

The air strikes focused heavily on areas in northern Gaza, including Gaza City, where ground incursions were taking place.

People in the southern Gaza Strip said they heard the explosions and saw the sky light up - but had no means of checking on family and friends in the targeted areas.

“Gaza is isolated from the rest of the world. Strikes are hitting right next to us, around us and no one can reach us or locate the strike," said Gaza resident Um Yehia, who went south after the Israeli warning and is now sheltering inside the Nasser Hospital in Khan Younis.

🔴2.2 Million Gazans isolated from the world

On Friday telecommunications providers in Gaza suffered a complete disruption of all services after heavy Israeli bombing destroyed their last remaining infrastructure connecting it to the global internet👇

— °®Âþµº (@The_NewArab)

Bilal Abu Mostafa's barber shop was destroyed two weeks ago. Like many Gazans he has taken shelter in a hospital, where doctors are struggling to keep pace with casualties.

He turned a damaged ambulance into a makeshift barber shop.

After dark he goes up into a hospital room to give hair cuts to "people severely burned or broken and can't come downstairs".

Aid supplies to Gaza have been choked since Israel began bombarding the enclave in response the Hamas attacks, and the communications isolation also hit aid agencies, complicating already severe shortages of food, fuel and medicine.

The Palestinian Red Crescent said on Sunday it received 10 trucks from the Egyptian Red Crescent through the Rafah crossing, containing food supplies and medical supplies, bringing the total to 94.

Thousands of Gaza residents broke into warehouses and distribution centres of the U.N. Palestinian refugee agency (UNRWA) grabbing flour and "basic survival items", the organisation said on Sunday.

"This is a worrying sign that civil order is starting to break down after three weeks of war and a tight siege on Gaza," UNRWA said in a statement.

An Israeli official said on Sunday Israel would allow a dramatic increase in aid to Gaza in the coming days, calling again on Palestinian civilians to head to what he described as a "humanitarian" zone in the south of the territory.

Kholoud Qdeih and 20 of her extended family are now living in the basement of a building in Khan Younis, in the south. She and other relatives had been living close to the border with Israel and have moved deeper into the city.

She lost a son in a previous Gaza war but remains defiant.

"We will remain in our land steadfast, even if they entered with the tanks, whatever happens, we will remain steadfast," said Qdeih. "We will not make the mistake of our forefathers when they left in 1948. We will always stay in our home."

(Reuters)