Israel has approved a plan to capture all of the Gaza Strip and remain there for an unspecified length of time, Israeli officials say.
The plan includes distributing aid, though supplies will not be let in yet.
The Israeli official said the newly approved offensive plan would move Gaza's civilian population southward and keep humanitarian aid from falling into Hamas's hands.
On Sunday, the United Nations rejected what it said was a new plan for aid to be distributed in what it described as Israeli hubs.
It comes as the blockade of Gaza continues, despite international outcry and the devastating humanitarian situation inside.
Israeli cabinet ministers approved plans for the new offensive on Monday morning, hours after it was announced that tens of thousands of reserve soldiers are being called up.
Prime Minister Benjamin Netanyahu has so far failed to achieve his goal of destroying Hamas or returning all the hostages, despite more than a year of brutal war in Gaza.
Officials say the plan will help with these war aims but it would also push hundreds of thousands of Palestinians to southern Gaza, exacerbating an already dire humanitarian crisis.
They said the plan included the "capturing of the strip and the holding of territories".
It would also try to prevent Hamas from distributing humanitarian aid, which Israel says strengthens the group's rule in Gaza.
The UN rejected the plan, saying it would leave large parts of the population, including the most vulnerable, without supplies.
It said it "appears designed to reinforce control over life-sustaining items as a pressure tactic - as part of a military strategy".
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More than 52,000 Palestinians have been killed since the IDF launched its ground offensive in the densely-populated territory, according to the Hamas-run health ministry.
It followed the deadly Hamas attacks on Israel, which killed 1,200 people and saw around 250 people taken hostage.
A fragile ceasefire that saw a pause in the fighting and the exchange of Israeli hostages and Palestinian prisoners collapsed earlier this year.