The Israel Defense Forces (IDF) has urged Palestinians to evacuate Gaza City, relocating to what it calls a humanitarian zone in the south as it continues its military offensive in the territory.
On Saturday, for a second day running, the Israeli military destroyed a high-rise block, the Sussi Tower, in the enclave's largest urban area.
Defence Minister Israel Katz posted video of the building collapsing on X, captioned We're continuing. It was not immediately clear whether there were any casualties.
Israel said the tower was being used by Hamas, and that its military had taken measures to mitigate harm to civilians. Hamas denies it was using the tower.
Ahead of the attack on Sussi Tower, the Israeli air force had dropped leaflets ordering residents to leave.
In a social media post, IDF Arabic-language spokesman Avichay Adraee urged them to join the thousands of people who have already gone to al-Mawasi - an area between Khan Younis and the coastline in the south of the Gaza Strip.
The IDF has repeatedly encouraged civilians to move there, saying medical care, water and food will be provided. However, the UN has said the tent camps in al-Mawasi are overcrowded and unsafe, and that southern hospitals are overwhelmed.
The Sussi Tower is the second high-rise to be destroyed in as many days. On Friday social-media footage showed the Mushtaha Tower, in the city's al-Rimal neighbourhood, collapsing after a massive explosion at its base.
Israeli Prime Minister Benjamin Netanyahu announced Israel's intention to seize all of the Gaza Strip after indirect talks with Hamas on a ceasefire and hostage release deal broke down in July. The UN estimates nearly one million people remain in Gaza City, where it declared a famine last month. It has warned of an imminent disaster if the assault proceeds.