A senior Hamas official said on Sunday that Hamas has not withdrawn from ceasefire talks with Israel after this weekend's deadly attacks in Gaza that Israel said had targeted Hamas leader Mohammed Deif.

But Izzat El-Reshiq, a member of the political office of Hamas, accused Israel of trying to derail efforts by Arab mediators and the United States to reach a ceasefire deal by stepping up its attacks in the enclave.

Saturday's strike in the Khan Younis area of Gaza, in which at least 90 Palestinians were killed, according to local health authorities, has put the ceasefire talks in doubt.

There had been increasingly hopeful signs in recent days that a deal could be reached to halt fighting and return hostages held in Gaza.

Two Egyptian security sources at ceasefire talks in Doha and Cairo said on Saturday that negotiations had been halted after three days of intense talks.

Israeli Prime Minister Benjamin Netanyahu was expected to convene his close circle of ministers later on Sunday to discuss the talks.

The strike on Saturday which targeted Deif killed Rafa Salama, commander of Hamas' Khan Younis brigade, the Israeli military said on Sunday, but there was no confirmation about the fate of Deif.

"The strike in Khan Younis was a result of surgical intelligence," the head of the Shin Bet domestic security service said in a video released by the service from Rafah.

On Saturday, a senior Hamas official denied that Deif had been killed and the group said Israeli claims were aimed at justifying the attack.

Israel's military chief said on Sunday in a televised statement that Hamas was concealing the truth about Deif's fate, but stopped short of confirming whether he was alive or dead.

Israeli forces pressed ahead on Sunday with aerial and ground shelling of several areas across the Gaza Strip, home to 2.3 million people, most of whom have been displaced by the war.