Hamas has announced it is delaying the release of further Israeli hostages.
A statement by its military wing says Israel has broken the terms of the truce deal - a claim that Israel has denied.
A Hamas official told the BBC that Israel had stopped 97 aid trucks from reaching northern Gaza, and also flew drones over southern Gaza.
A group of up to 14 hostages had been expected to be released on Saturday.
As part of the Qatar-brokered truce, Friday saw the release of 24 Israeli hostages - and 39 Palestinians from Israeli prisons.
Today is the second day of a four-day pause in fighting between Israel and Hamas in the Gaza Strip.
Hamas’s attacks on 7 October killed 1,200 people, with about 240 taken hostage.
Since then, Gaza's Hamas-run health ministry says more than 14,500 people have been killed in Israel's retaliatory campaign.
