More than 220 Israeli hostages remain in captivity as the war with Hamas continues. 

Four women have been released — one says she was led through a spider's web of damp tunnels into a large hall where she was under 24-hour guard. 

US Correspondent Richard Arnold told Mike Hosking that hopes for the rest remain unclear. 

He says the US and Israel are pressing for a much larger hostage release but they're tough negotiators. 

Meanwhile, more than 700 Palestinians were also killed overnight by Israeli air strikes, according to Gaza's health ministry. 

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