The militant group reiterated key demands that Israel again rejected. After earlier signs of progress, the outlook appeared to dim as Prime Minister Benjamin Netanyahu vowed to resist international pressure to halt the war.
Defence Minister Yoav Gallant claimed Hamas wasn't serious about a deal and warned of "a powerful operation in the very near future in Rafah and other places across all of Gaza" after Hamas attacked Israel's main crossing point for delivering badly needed humanitarian aid, killing three soldiers.
Israel's military said it believed Hamas was targeting soldiers massed on the Gaza border in preparation for a possible Rafah invasion. Hamas said it targeted soldiers in the area.
But Israeli media reported that CIA chief William Burns, a main mediator in the talks, would meet with Netanyahu on Monday.
Israel didn't send a delegation to the latest talks. Egyptian state media reported that the Hamas delegation went for discussions in Qatar, where the group has a political office, and will return to Cairo for further negotiations on Tuesday.
Israeli representatives did not attend talks over a ceasefire in Gaza held in Cairo at the weekend. (AP PHOTO)
Another threat to talks came as Israel ordered the local offices of Qatar's Al Jazeera satellite news network to close, accusing it of broadcasting anti-Israel incitement. The ban did not appear to affect the channel's operations in Gaza or the West Bank.
Netanyahu, under pressure from hardliners in his government, continued to lower expectations for a ceasefire deal, calling the key Hamas demands "extreme".
Hamas leader Ismail Haniyeh in a statement earlier said the militant group was serious and positive about the negotiations and that stopping Israeli aggression in Gaza is the main priority.
But Israel's government again vowed to press on with a military operation in Rafah, the southernmost Gaza city on the border with Egypt where more than half of Gaza's 2.3 million residents now seek shelter from Israeli attacks. Rafah is a key entry point for aid.
Kerem Shalom, now closed, is another. The Israeli military reported 10 projectiles were launched at the crossing in southern Israel and said its fighter jets later struck the source. Israel's Channel 12 said 10 soldiers remained hospitalised. It was unclear how long the crossing would be closed.
The head of the UN agency for Palestinian refugees, Philippe Lazzarini, called for an independent investigation and "accountability for the blatant disregard of humanitarian workers". He also said Israel this week denied him entry to Gaza for a second time.
The closing of Kerem Shalom came shortly after the head of the UN World Food Program asserted "full-blown famine" in devastated northern Gaza, one of the most prominent warnings yet of the toll of restrictions on aid entering the territory. It was not a formal famine declaration.
In a fiery speech for Israel's annual Holocaust memorial day, Netanyahu said: "I say to the leaders of the world, no amount of pressure, no decision by any international forum will stop Israel from defending itself."
The Hamas cross-border attack on October 7 killed some 1200 people and took 250 others hostage. Israel says militants still hold around 100 hostages and the remains of more than 30 others. Netanyahu is under pressure from some hostages' families to make a deal to end the war and get hostages freed.
Israeli's air and ground offensive has killed over 34,500 people, according to Palestinian health officials, who don't differentiate between civilians and combatants but say women and children make up a majority of those killed.
Israel blames Hamas for civilian deaths, accusing it of embedding in residential and public areas. The Israeli military says it has killed 13,000 militants, without providing evidence to back up the claim.
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