DEIR AL-BALAH, Gaza Strip — Israel struck and destroyed another high-rise building in Gaza City on Monday after warning residents to evacuate, part of an offensive aimed at taking over the largest Palestinian city. The military said it was targeting Hamas observation posts and bombs placed around the 12-story office building.

Over several days, Israel has destroyed multiple high-rise buildings in Gaza City, accusing Hamas of putting surveillance infrastructure in them. It has ordered people to flee ahead of its ground offensive into the city of some 1 million residents, which experts say is experiencing famine.

U.S. President Donald Trump said he was giving his “last warning” to Hamas regarding a possible ceasefire, as Arab officials described a new U.S. proposal for the immediate release of all the remaining hostages in exchange for 3,000 Palestinian prisoners and a temporary ceasefire. A senior Hamas official called it a “humiliating surrender document,” but the militant group said it would keep negotiating.

The Israeli military said four soldiers were killed in Gaza City on Monday when a group of militants threw an explosive device into a tank. Another soldier was wounded in an ensuing gunbattle, according to the military, which said two of the militants were shot.

Israel’s offensive has killed most of Hamas’ top leadership and vastly diminished its military capabilities. But the group still carries out sporadic guerrilla-style attacks. More than 450 Israeli troops have been killed in Gaza since the ground invasion began in 2023.