The Israeli government has not provided an exact timetable on when its forces would enter the area, but according to the civil defence agency spokesman Mahmud Bassal, air strikes on Gaza City have been increasing for the past three days.

Bassal said the residential neighbourhoods of Zeitoun and Sabra have been hit "with very heavy airstrikes targeting civilian homes, possibly including high-rise buildings".

"For the third consecutive day, the Israeli occupation is intensifying its bombardment," said the spokesman.

"The Israeli occupation is using all types of weapons in that area -- bombs, drones, and also highly explosive munitions that cause massive destruction to civilian homes," he added.

Bassal said that at least 24 people had been killed across Gaza on Tuesday, including several casualties caused by strikes on Gaza City.

"The bombardment has been extremely intense for the past two days. With every strike, the ground shakes. There are martyrs under the rubble that no one can reach because the shelling hasn't stopped," said Majed al-Hosary, a resident in Zeitoun.

Israel has faced mounting criticism over the 22-month-long war with Hamas, with United Nations-backed experts warning of widespread famine unfolding in besieged Gaza.

Netanyahu is under mounting pressure to secure the release of the remaining hostages, as well as over his plans to expand the war, which he has vowed to do with or without the backing of Israel's allies.

Hamas's 2023 attack on Israel, which triggered the war, resulted in the deaths of 1,219 people, according to an AFP tally based on official figures.

Israel's offensive has killed at least 61,499 Palestinians, according to the health ministry in Hamas-run Gaza, whose toll the United Nations considers reliable.