Special envoy to the Middle East Steve Witkoff and President Donald Trump's son-in-law and businessman Jared Kushner arrived in Israel on Monday morning to bolster the ceasefire agreement and to continue implementation of the second phase of Trump's 20-point Gaza plan.

Before Monday, Hamas had handed over all living hostages and 12 out of 28 deceased hostages under a ceasefire.

An Israeli security official said the transfer of aid into the territory is halted "until further notice," the first major test of the ceasefire.

Israeli fire killed three people near a ceasefire line in Gaza on Monday, medics said, with U.S. envoys expected in Israel to try to push forward the fragile truce that faced its gravest test so far over the weekend.

Detainees seek to return to their normal lives in Gaza after being freed from Israeli captivity, where some say they faced torture and beatings.

After Israel-Hamas clashes test Trump's Gaza peace deal, his top negotiators return to the region to shore up the ceasefire.

The United States has informed the guarantor nations of the Gaza peace agreement of credible reports indicating an imminent ceasefire violation by Hamas against the people of Gaza,” the state department said on Saturday evening.

Health officials in Gaza confirmed Israeli airstrikes had killed more than forty people. Israel accused Hamas of killing two Israeli soldiers near Rafah in southern Gaza. President Trump has sent a high level US team back to Israel to oversee the next phase of the truce.