Thousands of reservists have begun reporting for duty as the Israeli military presses ahead with its offensive to conquer Gaza City.
Ground forces are already pushing into the outskirts of Gaza's largest urban area, which the military has said is a stronghold of Hamas.
The city is also coming under heavy Israeli aerial and artillery bombardment, with local hospitals saying that more than 50 Palestinians have been killed there since midnight.
The military has ordered residents to evacuate and head south immediately. The UN says an estimated 20,000 have done so over the past two weeks, but almost a million remain.
UN humanitarian officials have warned that the impact of a full-blown offensive would be 'beyond catastrophic', not only for those in the city but for the entire Gaza Strip.
Last month, the Israel Defense Forces (IDF) said about 60,000 reservists would be called up ahead of 'Operation Gideon's Chariots II' – the next phase of the ground offensive that it launched in May and has seen it take control of at least 75% of Gaza.
It also extended the service of 20,000 reservists who had already been mobilised.
On Tuesday, an Israeli military official said thousands had begun reporting for duty.
Israeli media said many of the reservists would be deployed to the occupied West Bank and northern Israel to free up active-duty personnel for the offensive.
They also reported that some combat units were seeing lower turnout than for previous call-ups, with reservists who had already served several tours during the 22-month war requesting exemptions for personal or financial reasons.
Prime Minister Benjamin Netanyahu announced that Israel would conquer all of Gaza after indirect talks with Hamas on a ceasefire and hostage release deal broke down in July.
At a government meeting on Sunday, he said the security cabinet had agreed the IDF's objectives were 'defeating Hamas and releasing all of our hostages'.
The armed group is currently holding 48 hostages, 20 of whom are believed to be alive.
The hostages' families fear the new offensive will endanger them and are demanding the prime minister negotiate an agreement that would secure their release.
On the ground in Gaza on Tuesday, hospital officials said Israeli strikes and fire had killed at least 95 Palestinians since midnight.
Al-Shifa hospital in Gaza City reported 35 of the deaths, including nine people who were killed in an air strike in the southern Tal al-Hawa neighborhood.
The UN has also said tent camps for the displaced in the south are overcrowded and unsafe, and that southern hospitals are operating at several times their capacity.
Medics in the hospital's emergency department told the BBC that most of the casualties being treated were children and elderly.
Israel has said there are no restrictions on aid deliveries and has disputed the health ministry's figures on malnutrition-related deaths.
The Israeli military launched a campaign in Gaza in response to the Hamas-led attack on southern Israel on 7 October 2023, in which about 1,200 people were killed and 251 others were taken hostage.
At least 63,633 people have been killed in Gaza since then, according to the territory's health ministry.
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