US Vice President JD Vance downplayed concerns about the fragility of the Israel-Hamas ceasefire while speaking in Israel on Tuesday, even as some Trump administration officials are privately concerned the deal could fall apart, sources familiar with the matter told CNN.

"What we've seen the past week gives me great optimism the ceasefire is going to hold," Vance said at a news conference.

"I feel very optimistic. Can I say with 100 per cent certainty that it's going to work? No."

Vance also declined to put a timeline on both the return of all Israeli hostage remains and Hamas' disarmament, saying it will "take a little bit of time" and that security and humanitarian structures must be implemented in Gaza.

"If Hamas doesn't comply with the deal, very bad things are going to happen. But

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