A destroyed UN vehicle is seen in Beit Lahia in the northern Gaza Strip on Tuesday following Israeli military strikes.

AFP

The Palestinians said factions were ready for new Gaza truce and Washington said Israel had sought help on Tuesday in calming a 22-day conflict that has killed nearly 1,200 people in the enclave.

But the Israeli government remained silent on the subject while continuing its bombardment, leaving scores more dead more than three weeks after launching a military offensive against rocket-firing militants.

US Secretary of State John Kerry said that Israeli Prime Minister Benjamin Netanyahu had asked for fresh help from America in trying to broker a ceasefire.

"Last night we talked, and the prime minister talked to me about an idea and a possibility of a ceasefire. He raised it with me, as he has consistently," said Kerry.

The top US diplomat added that Netanyahu had said he "would embrace a ceasefire that permits Israel to protect itself against (Palestinian militants') tunnels and obviously not be disadvantaged for the great sacrifice they have made thus far."

There was no Israeli government comment. 

Yasser Abed Rabbo, secretary general of the Palestine Liberation Organisation, said after consultations with Hamas and Islamic Jihad, the two main militant groups in Gaza, that there was "willingness for a ceasefire and humanitarian truce for 24 hours".

A joint delegation headed by Palestinian president Mahmud Abbas would travel to Cairo to take the next step, he added.

"This is more proof that we have a unified Palestinian stand," Abed Rabbo told reporters. "The delegation will head to Cairo under the PLO umbrella represented by president Mahmud Abbas."

Hamas said so far it had not agreed to any new truce and was waiting for Israel to show its hand first.

"When we have an Israeli commitment... on a humanitarian truce, we will look into it but we will never declare a truce from our side while the occupation keeps killing our children," Hamas spokesman Sami Abu Zukhri said on his Facebook page.

A series of ceasefires in recent days have failed to take hold, as both sides appeared more determined than ever to keep up the fighting.

The Israeli offensive, which began on July 8, has killed more than 1,190 Palestinians, mostly civilians according to the United Nations, and injured over 7,000.

Fifty-six lives have been lost on the Israeli side, all but three of them soldiers.

On Monday night, a deluge of bombs rained down on Gaza, after an uneasy truce to mark the end of the Muslim fasting month of Ramadan and the Eid al-Fitr holiday.

Shells fired from tanks struck Gaza's biggest power plant bringing it grinding to a halt, and exacerbating already widespread blackouts, the electricity authority said.

And an air strike targeted the home of top Hamas leader Ismail Haniya in Gaza City's Shati refugee camp, officials said.

The raids came after Israel announced that five of its soldiers were killed in an ambush late on Monday after militants sneaked into southern Israel by a tunnel.

On the same day, mortar fire killed four Israeli soldiers near a southern kibbutz, the army said, while another soldier had been killed in action in southern Gaza.

The World Health Organisation now estimates that more than 215,000 people, or one Gazan in every eight, have fled their homes in the overcrowded territory.

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