Biden says Gaza ceasefire unlikely by Monday, shootings to complicate talks

US President Joe Biden said a ceasefire in war-torn Gaza was now unlikely to happen by Monday, adding that a shooting incident at an aid point would likely complicate negotiations.

Biden said on Thursday that the United States was checking "competing versions" of the incident in which the health ministry in the Hamas-run Palestinian territory said Israeli troops shot dead 104 people.

Earlier this week Biden had predicted a deal was possible by Monday to implement a ceasefire between Israel and Hamas in Gaza in exchange for the release of hostages held by Hamas.

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"Hope springs eternal," Biden told reporters when asked about the ceasefire timing, as he left the White House for a pre-election trip to Texas to visit the US-Mexico border.

"I was on the telephone with people in the region... Probably not by Monday, but I'm hopeful."

The US president said he did not yet have clarity on what happened in Gaza City earlier on Thursday, when one of the worst single incidents of the nearly five-month war occurred.

"We're checking that right now. There are two competing versions of what happened, I don't have an answer yet," Biden told reporters as he headed to his helicopter.

Asked if he was worried whether it would complicate the delicate negotiations for a ceasefire, Biden replied: "I know it will."

The health ministry in Hamas-run Gaza said Israeli forces there opened fire on a crowd of Palestinians at an aid distribution point Thursday, killing at least 104 people and wounding over 700.