Israel rejected international proposals for a ceasefire in its fight against Islamist militants in Gaza on Friday, but is discussing changes to the truce plan with Secretary of State John Kerry, a government source said.
Mediators hope that a truce could come into force ahead of a Muslim festival that starts early next week, but they have struggled to resolve seemingly irreconcilable demands from Israel and Hamas-led fighters, locked in conflict since July 8.
Hamas, which wants an end to an Israeli-Egyptian blockade of Gaza before agreeing to halt hostilities, has yet to respond to the ceasefire proposition, which has not been made public.
The Israeli source, who declined to be named, said Prime Minister Benjamin Netanyahu's security cabinet had turned down the plan because it did not let Israel carry on hunting down Hamas's tunnel network that criss-crosses the Gaza border.
"Kerry's proposal leans (too much) towards Hamas's demands," said the source.
As diplomacy faltered, fighting raged.
Gaza officials said Israeli strikes killed 55 people on Friday, including the head of media operations for Hamas ally Islamic Jihad and his son. They put the number of Palestinian deaths in 18 days of conflict at 844, most of them civilians.
Militants fired a barrage of rockets out of Gaza, triggering sirens across much of southern and central Israel, including at the country's main airport. No injuries were reported, with the Iron Dome interceptor system knocking out many of the missiles.
The Gaza turmoil stoked tensions in the nearby occupied West Bank, where U.S.-backed Palestinian President Mahmoud Abbas governs in uneasy coordination with Israel.
Medics said six Palestinians were killed in separate incidents near the cities of Nablus and Hebron, including one shooting that witnesses blamed on an apparent Jewish settler.
On Thursday night, 10,000 demonstrators marched in solidarity with Gaza near the Palestinian administrative capital Ramallah - a scale recalling mass revolts of the past. Protesters surged against an Israeli army checkpoint, throwing rocks and Molotov cocktails, and Palestinian medics said one was shot dead and 200 wounded when troops opened fire.
Israel said three more of its soldiers were killed in Gaza on Friday, bringing the army death toll to 35, as troops battled militants in the north, east and south of Gaza -- a tiny Mediterranean enclave home to 1.8 million Palestinians.
It also announced that a soldier unaccounted for after an ambush in Gaza six days ago was definitely dead, although his body had not been recovered. Hamas said on Sunday it had captured the man, but did not release a photograph of him.
Three civilians have also been killed in Israel by rockets from Gaza - the kind of attack that surged last month amid Hamas anger at a crackdown on its activists in the West Bank, prompting the July 8 launch of the Israeli offensive.
The growing Israeli casualty list has only strengthened resolve in the country to pursue this latest campaign against Hamas until the group is significantly weakened.
Kerry, based in neighboring Egypt for much of the week, is seeking a limited humanitarian truce under which Palestinian movement would be freed up to allow in aid and for the dead and wounded to be recovered.
A Palestinian official close to the negotiations said Turkey and Qatar had proposed a 7-day halt to the fighting, which had been relayed to Israel by Kerry while Hamas considered it.
Israel insisted that, even if such a ceasefire was agreed, its army should continue digging up tunnels along Gaza's eastern frontier, a mission that could take between one and two weeks.
Netanyahu has said a truce should also lead to the eventual stripping of Gaza's rocket arsenals - something Hamas rules out.
"We must stop the rocket launches. How this is done - whether through occupying (Gaza), or broadening (the operation), or (international) guarantees, or anything else, I have to see it with my own eyes," said police minister Yitzhak Aharonovitch.
The rockets have sent Israelis regularly rushing to shelters and dented the economy despite Iron Dome's high rate of success.
A Hamas rocket intercepted near Ben Gurion Airport on Tuesday prompted the U.S. Federal Aviation Administration (FAA) to halt American commercial flights to Israel's main international gateway. Some European carriers followed suit.
Jolted by the blow at the height of an already stagnant summer tourism season, Israel persuaded U.S. authorities to lift the flight ban on Thursday, after which the European aviation regulator removed its own advisory against flying to Ben Gurion.
In the second such salvo in as many days, Hamas said it fired three rockets at the airport on Friday, an apparent bid to cripple operations there again. There was no word of impacts at Ben Gurion, whose passenger hall emptied at the sound of sirens.
HAMAS WANTS GAZA OPENED UP
Hamas leader Khaled Meshaal had on Wednesday voiced support for a humanitarian truce, but only if Israel eased restrictions on Gaza. Hamas wants Egypt to open up its border with Gaza, too, and demands that Israel release hundreds of prisoners rounded up in the West Bank last month following the kidnap and killing of three Jewish seminary students.
Such concessions appear unlikely, however, as both Israel and Egypt consider Hamas a security threat.
One Cairo official said next week's Eid al-Fitr festival, which concludes Ramadan, was a possible date for a truce. It was not immediately clear if Kerry, whose mediation has involved Egypt, Turkey, Qatar and Abbas, would remain in Cairo.
On Thursday, a U.S. official said Kerry would not stay in the region "for an indefinite amount of time".
More than 160,000 Palestinians have been displaced in Gaza by the fighting, many of them seeking shelter in buildings run by the United Nations Relief and Works Agency (UNRWA).
The World Health Organisation (WHO) called on Friday for a humanitarian corridor to be set up in Gaza to allow aid workers to evacuate the wounded and bring in life-saving medicines.
"People are dying at an alarming rate, being injured at a very alarming rate," Jens Laerke of the U.N. Office for the Coordination of Humanitarian Affairs (OCHA) told reporters.
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