Israel has said it is suspending the entry of aid into Gaza, where both Israel and Palestinian sources reported Israeli military strikes as Hamas alleged a "coup" against a six-week-old truce.
The health ministry in Hamas-run Gaza reported at least four people were killed and six wounded in Israeli attacks.
As the 42-day first phase of the ceasefire drew to a close with negotiations inconclusive, Israel earlier approved a truce extension that it said US Middle East envoy Steve Witkoff proposed.
The extension would cover the Muslim holy month of Ramadan and the Jewish holiday of Passover.
Hamas has repeatedly rejected an extension, instead favouring a transition to the truce deal's second phase.
As outlined by former US president Joe Biden, the second phase would bring a permanent end to the war that began on 7 October 2023 when Hamas attacked Israel.
The truce's first phase saw an increase of aid into the territory, where the war destroyed or damaged most of Gaza's buildings, displaced almost the entire population and triggered widespread hunger, according to the United Nations.
Israel announced that it was suspending the entry of supplies into Gaza, and threatened "consequences" for Hamas if it did not accept a proposal for a temporary extension of the truce in the enclave.
Israeli Prime Minister Benjamin Netanyahu's office said he had "decided that, from this morning, all entry of goods and supplies into the Gaza Strip will be suspended".
"Israel will not allow a ceasefire without the release of our hostages," Mr Netanyahu's office said.
Hamas said the "decision to suspend humanitarian aid is cheap blackmail, a war crime and a blatant coup against the (ceasefire) agreement".
Commenting on the goods suspension, senior Hamas official Sami Abu Zuhri told Reuters the decision would impact the ceasefire talks, adding his group "doesn't respond to pressures".
'Extremely worrying' - Harris
It is "extremely worrying" that humanitarian aid from Ireland and others countries cannot get into Gaza, the Tánaiste Simon Harris has said.
Four truck loads of humanitarian aid destined for Gaza, and which have been funded by Ireland, are being held-up by Israel's suspension of deliveries.
The vehicles are carrying both food aid and emergency shelter provisions.
Mr Harris said the trucks are carrying provisions that "will support 6,000 people".
"Our priority now is to work through our diplomatic channels and with our international allies to ensure this aid can get in to help the people of Gaza - children, women and men who are enduring devastating conditions," he added.
It is understood they are currently in the Jordanian capital, Amman, waiting for clearance to get to Gaza.
Wide gaps on key areas of truce
Over the past six weeks, both sides have accused the other of breaching the agreement.
But despite repeated hiccups, it has remained in place while the hostage for prisoner exchange envisaged in the first phase was completed.
Hamas' armed wing posted a video showing Israeli hostages still in its custody in Gaza and stressed that the remaining hostages can only be freed through a swap deal as stated under the phased ceasefire agreement that began in January.
But there are wide gaps on key areas regarding a permanent end to the war, including what form a post-war administration of Gaza would take and what future there would be for Hamas.
Gaza's civil defence agency reported "artillery shelling and gunfire from Israeli tanks" east of Khan Younis city in southern Gaza.
The Israeli army said it was "unaware of any artillery shelling in this area".
The Palestine Red Crescent, however, reported one person killed in an Israeli drone strike in the area, and one more killed in another town nearby.
The Israeli military said it had conducted an airstrike in northern Gaza targeting suspects it said had "planted an explosive device" near its troops.
Gaza's health ministry has recorded 116 people killed by Israel's military since the ceasefire took effect on 19 January, substantially reducing violence.
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Mediator Egypt, the Red Cross and the UN have all appealed for the truce to be maintained.
Egypt's Foreign Minister Badr Abdelatty urged the "full implementation" of the Gaza ceasefire deal, calling on the European Union to pressure Israel to enforce it.
"There is no alternative to the faithful and full implementation by all parties of what was signed last January," Mr Abdelatty said at a press conference in Cairo.
He called on the EU to exert "maximum pressure on the parties, especially the Israeli party, regarding commitment to the ceasefire agreement".
"We must now move forward with negotiations on the second phase, which will naturally be challenging," Mr Abdelatty said.
He added that progress remained possible "if goodwill and political will are present".
Following the announcement of the aid suspension, AFP images showed trucks loaded with goods lined up on the Egyptian side of the Rafah crossing to Gaza.
'Sabotaging' the ceasefire
According to Israel, the truce extension would see half of the hostages still in Gaza freed on the day the deal came into effect, with the rest to be released at the end if an agreement was reached on a permanent ceasefire.
Hamas spokesman Hazem Qassem later said Israel "bears responsibility for the consequences of its decision on the people of the Strip and the fate of its prisoners".
Its allied militant group, Islamic Jihad, accused Israel of "sabotaging" the ceasefire.
Of the 251 captives taken by Hamas during its 7 October 2023 attack on Israel, 58 remain in Gaza, including 34 the Israeli military has confirmed are dead.
Israeli mourners who turned out to farewell Shlomo Mansour, 85, whose body had been held in Gaza, said more should be done to get the remaining captives home.
"Return all of them immediately and then think about what to do," said Vardit Roiter.
Mr Mansour's body was among four that militants handed over on Thursday under the truce's first phase.
They were among a total of eight bodies and 25 living hostages Hamas handed over under the initial phase, in exchange for the release of about 1,800 Palestinian prisoners.
The aid suspension comes as Palestinians in Gaza, alongside much of the Muslim world, mark the second day of the holy month of Ramadan, during which the faithful observe a dawn to dusk fast.
In November, a UN-backed assessment found "a strong likelihood that famine is imminent" within northern Gaza.
Israeli Foreign Minister Gideon Saar called such warnings "a lie during all this war".
Hamas's 7 October 2023 attack resulted in the deaths of more than 1,200 people in Israel, mostly civilians, while Israel's retaliation in Gaza killed more than 48,300 people, also mostly civilians, data from both sides show.
US Secretary of State Marco Rubio, whose country is Israel's top military supplier, said that he signed a declaration "to expedite" delivery of about $4 billion (3.8 billion) in military assistance to Israel.
Abu Mohammed al-Basyuni, 56, had a message for America: "Enough bias towards one party," he said among debris in Gaza City.
"As a people, we have the right to life and the right to coexist. Animals have rights. What about humans?"
In Gaza City, 21-year-old Mays Abu Amer expressed hope the ceasefire can continue "for a longer period of time and forever as well because we have so much destruction, we need a lot of time for reconstruction".
Egypt's foreign minister said Egypt's Gaza reconstruction plan - that ensures Palestinians remain on their land - is ready and will be presented to the emergency Arab summit on Tuesday.
Arab states, who were swift to reject President Donald Trump's plan for the US to take control of Gaza and resettle Palestinians, are scrambling to agree on a diplomatic offensive to counter the idea.
Mr Trump's plan, announced on last month during the fragile ceasefire, has infuriated Palestinians and Arab countries and upended decades of US diplomacy focused on a two-state solution.
The Egyptian counter reconstruction plan, according to Mr Abdelatty, will not be purely Egyptian or Arab but will gain international support and funding to ensure its successful implementation.
"We will hold intensive talks with major donor countries once the plan is adopted at the upcoming Arab Summit," Mr Abdelatty said in a press conference with the EU Commissioner for the Mediterranean Dubravka Šuica.
Mr Abdelatty said Europe’s role, especially in the economic aspect of rebuilding the enclave, is critical.
Asked about the second phase of the ceasefire deal, Mr Abdelatty said Egypt will continue its intensive efforts to ensure the ceasefire is maintained and negotiations for the second phase can begin.
He stressed the importance of safely executing the ceasefire agreement signed in January, emphasising its commitment to ensuring its proper implementation.
"The first phase has concluded successfully, and now we must shift to discussions on the second phase, which is key to sustaining the ceasefire," he said.
"Naturally, it will be difficult, but with goodwill and political determination, it can be achieved."
Read more:
Gaza truce talks inconclusive with first phase expiring
Gaza ceasefire 'must hold,' as first phase due to expire
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