Hamas has vowed it will not back down as Israel pounded Gaza with a fresh wave of strikes, killing five Palestinians.
The Israeli military has launched 21 airstrikes on Gaza since midnight on Saturday as talks to extend the temporary ceasefire stalled.
Palestinian health officials claim senior Hamas official Moaaz Zaid was among three Palestinians killed in an attack on a mosque. Two people travelling on a motorcycle died when they were struck by a bomb.
Another two Palestinians were shot dead by soldiers and dozens wounded in clashes with Israeli forces amid violent protests in occupied West Bank.
Palestinians pray over the bodies of three members of the same family The deaths bring the number of dead in the month-long conflict to nearly 1,900. The United Nations, which has condemned Israel's actions, say 1,354 of those killed have been civilians.
Israel has lost 64 soldiers during the conflict, while three civilians have died from rocket fire into the country.
Israel says Hamas has fired six rockets across the border since the 72-hour ceasefire ended on Friday morning, while Israel has carried out strikes on a total of 30 sites.
Smoke rises from what witnesses said was an Israeli strike on Gaza City Hamas spokesman Fawzy Barhum said: "There will be no going back, the resistance will continue. The occupier's intransigence will get it nowhere and we will make no concessions on the demands of our people."
The resumption of violence came as Britain announced it would send a team of NHS experts to help victims wounded in Gaza.
Prime Minister David Cameron said: "The conflict in Gaza has taken a terrible toll.
"The NHS has always stepped up to the plate to help those in need and this expert team will play a crucial role in helping hundreds caught up in this conflict."
Palestinian protesters clash with Israeli border guards in West Bank The UK team consists of doctors, nurses, surgeons, anaesthetists and paramedics - and their specialities include trauma and plastic surgery.
Mr Cameron is under increasing pressure to suspend arms exports from British manufacturers to Israeli forces following the resignation of foreign minister Baroness Warsi over the Government's line on Gaza this week.
Lady Warsi said the Government's approach had been "morally indefensible" and has stepped up her call for action to be taken.
A Palestinian boy sleeps in a UN-organised shelter "For me at that moment the concern that I had was that even if the ceasefire had held, and I sincerely hoped it had, there was still no clear language from the Government in relation to the condemnation of what had happened," she said.
"There was no clear commitment that we would lead the international effort on accountability on both sides for what had happened.
"Our language was not there. It was lagging behind. I don't think it was just words that would have stopped me from doing what I did.
Baroness Warsi's resiganation has placed pressure on David Cameron "I think it was a combination of issues. It was the language that we were using, I think it was our lack of support for international justice and accountability for the crimes that had been committed."
Deputy Prime Minister Nick Clegg has urged the coalition to halt arms export licences for ammunition, drone parts and armoured vehicles, which are being used in Operation Protective Edge. He had indicated on Thursday an announcement would be imminent.
The United States said it still hoped the three-day ceasefire could be revived and Egypt, which attempting to broker peace between Israelis and Palestinians with US and European mediators, insisted negotiations were making progress.
However, little movement seems to have been achieved and the two sides are still far apart on meeting terms of agreement.
In an interview with the New York Times on Friday, Barack Obama urged Israel to recognise Palestinians had a right to land and space to live.
He said: "It has consistently been my belief that you have to find a way to live side by side in peace with Palestinians ... You have to recognise that they have legitimate claims, and this is their land and neighbourhood as well."
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