Hamas has agreed to a ceasefire resolution adopted by the UN Security Council, senior Hamas official Sami Abu Zuhri tells the Reuters news agency.

Conversations on plans for Gaza after the Israel-Hamas war ends will continue on Tuesday afternoon and in the next couple of days, Secretary of State Antony Blinken said in Tel Aviv after talks with Israeli leaders. "It's imperative that we have these plans."

Blinken met Israeli officials on Tuesday in a push to end the eight-month-old Israeli air and ground war against Hamas that has devastated Gaza, a day after President Joe Biden's proposal for a truce was approved by the U.N. Security Council.

Ahead of Blinken's trip, Israel and Hamas both repeated hardline positions that have undermined previous mediation to end the fighting, while Israel has pressed on with assaults in central and southern Gaza, among the bloodiest of the war.

On Tuesday, however, senior Hamas official Sami Abu Zuhri, who is based outside Gaza, said it accepted the ceasefire resolution and was ready to negotiate over the details. It was up to Washington to ensure that Israel abides by it, he added.

He said Hamas accepted the formula stipulating the withdrawal of Israeli troops from Gaza and a swap of hostages held in Gaza for Palestinian prisoners jailed in Israel.

"The U.S. administration is facing a real test to carry out its commitments in compelling the occupation to immediately end the war in an implementation of the U.N. Security Council resolution," Abu Zuhri told Reuters.

Blinken said the Hamas statement was "a hopeful sign" but definitive word was still needed from the Hamas leadership inside Israeli-besieged Gaza. "That's what counts, and that's what we don't have yet."

The war began when Hamas-led Palestinian militants stormed into southern Israel from Gaza on Oct. 7, killing more than 1,200 people and seizing more than 250 as hostages, according to Israeli tallies.

Israel's retaliatory air and ground blitz in Gaza has killed more than 37,000 Palestinians, the Gaza health ministry has said, and reduced most of the narrow, coastal enclave to wasteland, with malnutrition widespread.

Biden's proposal envisages a ceasefire and release of hostages in exchange for Palestinians jailed in Israel in stages, ultimately leading to a permanent end to the war.

Israel has said it will agree only to temporary pauses in the war until Hamas is defeated, while Hamas has countered it will not accept a deal that does not guarantee the war will end.

Blinken, speaking to reporters before departing for neighbouring Jordan, also said his talks were also addressing day-after plans for Gaza, including security, governance, and rebuilding the densely populated enclave.

"We've been doing that in consultation with many partners throughout the region. Those conversations will continue...it's imperative that we have these plans," he said.