DEIR AL-BALAH, Gaza Strip (AP) -- Qatar has suspended its key mediation efforts between Hamas and Israel, it said Saturday, after growing frustration with the lack of progress on a cease-fire deal for Gaza.

It wasn't immediately clear whether the remaining Hamas leadership hosted by Qatar must leave, or where it would go. Hamas has good relations with Iran and Turkey, and some of its leaders are now in Lebanon.

However, Qatar is highly likely to return to mediation efforts if both sides show "serious political willingness" to reach a deal, according to an official with Egypt, the other key mediator.

Qatar told Israel and Hamas it can't continue to mediate "as long as there is a refusal to negotiate a deal in good faith" and "as a consequence, the Hamas political office no longer serves its purpose" in Qatar, a diplomatic source briefed on the matter said. Qatar told Hamas it will have to leave if it isn't ready to engage in serious negotiations, the source said.

In Washington, a U.S. official said the Biden administration informed Qatar two weeks ago that the Hamas office's continued operation in Doha was no longer useful and the Hamas delegation should be expelled.

A senior U.S. official said that after Hamas rejected the last proposal for a cease-fire, Qatar accepted the advice and informed the Hamas delegation of the decision 10 days ago.

A senior Hamas official said they were aware of Qatar's decision to suspend mediation efforts, "but no one told us to leave." Hamas has repeatedly called for an end to the war and a full withdrawal of Israeli forces from Gaza as a condition for any cease-fire deal. Israel seeks the return of all hostages taken in Hamas' Oct. 7, 2023 attack on Israel and insists on a presence in Gaza.

The officials spoke on condition of anonymity because of the sensitivity of the issue. The Israeli prime minister's office had no comment.

There continued to be no end in sight to the Israel-Hamas war in Gaza and the Israel-Hezbollah war in Lebanon, where Israel's military said it struck command centers and other militant infrastructure in Beirut's southern suburbs and elsewhere. An Israeli airstrike on the southern port city of Tyre late Friday killed at least seven, officials and a resident said.

Hezbollah "should continue (the fight) and we will continue to back them up even if we lose our families, our homes, and end up in the dirt," said one Beirut resident, Mohammed Mekdad, as people searched the smoking rubble.

In Gaza, Israeli strikes killed at least 16 people on Saturday, Palestinian medical officials said, while Israel announced the first delivery of humanitarian aid in weeks to the territory's hungry, devastated north.

One strike hit a school-turned-shelter in Gaza City's eastern Tufah neighborhood, killing at least six people, the territory's Health Ministry said. Two local journalists, a pregnant woman and a child were among the dead, it said. Israel's army said the strike targeted a militant belonging to the Palestinian Islamic Jihad group, offering no evidence.

Another Israeli strike killed seven people, including two women and a child in the southern city of Khan Younis, according to Nasser Hospital. Israel's army didn't respond to a request for comment.

And an Israeli strike hit tents in the courtyard of central Gaza's main hospital, killing at least three people and wounding a local journalist, Al-Aqsa Martyrs hospital in Deir al-Balah said. It was the eighth Israeli attack on the compound since March.

Israel says aid trucks reach northern Gaza

The Israeli military body in charge of humanitarian aid to Gaza, COGAT, said 11 aid trucks containing food, water and medical equipment reached the enclave's far north on Thursday. It's the first time any aid has reached there since Israel began a new military campaign last month.

But not all the aid reached the agreed drop-off points, according to the the U.N. World Food Program. In the urban refugee camp of Jabaliya, Israeli troops stopped one convoy bound for nearby Beit Lahiya and ordered the supplies to be offloaded, WFP spokesperson Alia Zaki said.

Israel's offensive has focused on Jabaliya, where Israel says Hamas had regrouped. Other areas affected include Beit Lahiya and Beit Hanoun just north of Gaza City.

U.S. deadline is looming for Israel

The aid announcement came days before a U.S. deadline demanding that Israel improve aid deliveries across Gaza or risk losing access to U.S. weapons funding. The U.S. says Israel must allow a minimum of 350 trucks a day carrying food and other supplies.

A report by the Integrated Food Security Phase Classification, or IPC, issued Thursday said there's a strong likelihood that famine is imminent in parts of northern Gaza, the territory's most isolated area.

COGAT rejected those findings and said the report relied "on partial, biased data and superficial sources with vested interests."

No emergency services functioning north of Gaza City

The U.N. estimates that tens of thousands of people remain in northern Gaza. Earlier this week, the Health Ministry said there were no ambulances or emergency crews operating north of Gaza City.

The conflict has left 90% of Palestinians in Gaza displaced, according to U.N. figures.

More than a year of war in Gaza has killed more than 43,000 people, Palestinian health officials say. They don't distinguish between civilians and combatants, but say more than half of those killed were women and children.

The war began after Palestinian militants stormed into Israel on Oct. 7, 2023, killing around 1,200 people -- mostly civilians -- and abducting 250 others. Some 100 hostages are still inside Gaza, about a third believed to be dead.

"It has been 400 days and the hostages are still in Gaza. There is a war without a direction. It's so sad," said Eial Tiskim, who attended the latest protest in Tel Aviv on Saturday night to demand a cease-fire deal.