Israel blocked the entry of aid trucks into Gaza on Sunday as a standoff over the truce that has halted fighting for the past six weeks escalated, with U.S.-designated terror group Hamas calling on Egyptian and Qatari mediators to intervene.

Mediators Egypt and Qatar accused Israel of violating humanitarian law by using starvation as a weapon, according to The Associated Press.

Israeli Prime Minister Benjamin Netanyahu's office said earlier that it had adopted a proposal by U.S. President Donald Trump's envoy, Steve Witkoff, for a temporary ceasefire in Gaza for the Ramadan and Passover periods, hours after the first phase of the previously agreed ceasefire expired.

The U.S. had no immediate comment, The Associated Press reported.

If agreed, the truce would halt fighting until the end of the Ramadan fasting period around March 31 and the Jewish Passover holiday around April 20.

The truce would be conditional on Hamas releasing half of the living and dead hostages on the first day, with the remainder released at the conclusion, if an agreement is reached on a permanent ceasefire.

Hamas says it is committed to the originally agreed ceasefire that had been scheduled to move into a second phase, with negotiations aimed at a permanent end to the war, and it has rejected the idea of a temporary extension to the 42-day truce.

A senior Hamas official, Mahmoud Mardawi, told Al Jazeera the group would only release the remaining Israeli hostages under the terms of the already agreed-upon phased deal.

U.N. Secretary-General Antonio Guterres called for "an immediate return of humanitarian aid to Gaza," urging "all parties to make the necessary efforts to avoid a return to hostilities in Gaza."

Egyptian sources said on Friday that the Israeli delegation in Cairo had sought to extend the first phase by 42 days, while Hamas wanted to move to the second phase of the ceasefire deal. Spokesman Hazem Qassem said on Saturday that the group rejected Israel's "formulation" of extending the first phase.

In the first phase of the ceasefire, Hamas handed over 33 Israeli hostages as well as five Thais returned in an unscheduled release, in exchange for around 2,000 Palestinian prisoners and detainees from Israeli jails and the withdrawal of Israeli troops from some of their positions in Gaza.

Under the original agreement, the second phase was intended to see the start of negotiations over the release of the remaining 59 hostages, the full withdrawal of Israeli troops from Gaza, and a final end to the war.

However, the talks never began and Israel says all its hostages must be returned for fighting to stop.

"Israel will not allow a ceasefire without the release of our hostages," Netanyahu's office said, announcing that the entry of all goods and supplies into the Gaza Strip would be halted. "If Hamas persists in its refusal, there will be additional consequences."

Hamas has denounced Israel's move as "blackmail" and a "blatant coup against the agreement."

"We call on mediators to pressure the occupation to fulfill its obligations under the agreement, in all its phases," it said, adding that the only way to get the hostages back would be to adhere to the agreement and start talks for the second phase.

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."

Later on Sunday, Israeli officials said a delegation would arrive in Cairo in an apparent move to discuss ways to defuse tensions and ensure the ceasefire remains in effect.

Speaking at a news conference with his Croatian counterpart, Israel's Foreign Minister Gideon Saar said Palestinians in Gaza would not get goods for free and further negotiations should be linked to the release of the hostages.

He said the United States "understands" Israel's decision to halt the entry of goods into Gaza, blaming Hamas for the current stalemate in the talks.

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.

But there are wide gaps on key areas regarding a permanent end to the war, including what form a postwar administration of Gaza would take and what future there would be for Hamas, which triggered Israel's invasion of Gaza with its attack on southern Israel on Oct. 7, 2023.

The attack killed 1,200 people, in the worst one-day loss of life in Israel's history and saw 251 people taken into Gaza as hostages. The Israeli campaign has killed more than 48,000 Palestinians, nearly half women and children, according to the Gaza health ministry, displaced almost all of its 2.3 million population and left Gaza a wasteland.

Israel insists that Hamas can play no part in the postwar future of Gaza and that its military and governing structures must be eliminated. It also rejects bringing into Gaza the Palestinian Authority, the body set up under the Oslo Accords three decades ago and which exercises limited governance in the occupied West Bank.

Hamas has said it would not insist on continuing to rule Gaza, which it has controlled since 2007, but it would have to be consulted over whatever future administration followed.

Some information for this article came from The Associated Press.

Reuters

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