Israeli Prime Minister Benjamin Netanyahu said he did not rule out further strikes on Hamas leaders "wherever they are", as the heads of Arab and Islamic states held a summit to show support for Qatar after Israel's attack on the Gulf state last week.
The September 9 strike targeting leaders of the Palestinian group in Doha marked a significant escalation of Israeli military action in a region shaken by conflict since the Hamas-led October 7, 2023 attacks that ignited the Gaza war.
While the assembled Arab and Muslim leaders were expressing solidarity with Qatar, US Secretary of State Marco Rubio met Netanyahu and gave strong backing for Israel's hardline stance, although Washington has expressed unease over the Qatar strike.
Speaking alongside Netanyahu in Israel, Rubio said the only way to end the war in Gaza would be for Hamas fighters to free all hostages and surrender. While the US wants a diplomatic end to the war, "we have to be prepared for the possibility that's not going to happen," he said.
Washington has said it was not warned in advance before Israel attacked Qatar. President Donald Trump said on Sunday Israel had to be "very, very careful".
"They have to do something about Hamas, but Qatar has been a great ally to the United States," Trump said.
Hamas has said the Israeli strike on Qatar killed five of its members, including a son of its exiled Gaza chief, but its leadership survived. Qatar says one of its security agents also died.
Qatari Emir Sheikh Tamim bin Hamad Al-Thani, addressing the emergency summit, urged "practical and decisive steps" in response to the "cowardly and treacherous" Israeli strike. He said the attack occurred as Hamas leaders were studying a US ceasefire proposal.
Rubio will travel to Qatar after his visit to Israel. He called on Qatar to continue to play a constructive role in resolving the Gaza conflict, saying it could help reach the goals of releasing all 48 hostages still held in Gaza, disarming Hamas and building a better future for Gazans.
But his words alongside Netanyahu suggested Washington now considers a diplomatic solution unlikely and is backing Israel's plan for a major new military operation that Netanyahu says will crush Hamas once and for all.
"As much as we may wish that there be a peaceful, diplomatic way to end it, and we'll continue to explore and be dedicated to it, we also have to be prepared for the possibility that's not going to happen," said Rubio, calling Hamas "savage terrorists".
"Hamas needs to cease to exist as an armed element that can threaten the peace and security of the region," he said.
With Rubio at his side, Netanyahu did not rule out annexing the Israeli-occupied West Bank in response to moves by some countries to recognize a Palestinian state at the UN General Assembly later this month. France and Britain are among the countries that have said they will do so.
Asked if Israel was considering extending its sovereignty to the West Bank, Netanyahu said: "A future step is a future step. We don't need to expose it ahead of time".
"It's clear that taking unilateral actions against us simply invites unilateral actions on our part," he said.
While diplomacy was unfolding in Jerusalem and Doha, Israeli forces were continuing their assault on Gaza City, where they killed at least 16 Palestinians in strikes on two homes and on a tent housing a displaced family, local health authorities said.
The army also hit and destroyed a 16-floor building in the west of the city, believed to be the tallest in the Gaza Strip, about an hour after warning displaced families sheltering inside and nearby to leave. It said the building was being used to hide "terrorist infrastructure."
The war in Gaza was triggered by a rampage into southern Israel by Hamas fighters who killed around 1,200 people and captured 251 hostages, according to Israeli tallies. Israel responded with an assault that has killed more than 64,000 people, according to Palestinian health authorities.
