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.

In Jerusalem, two Palestinian gunmen opened fire at a bus station, killing six people and wounding 12 in the worst such attack on Israelis in nearly a year.

Tensions have soared across Israel and the occupied West Bank in the two years since Hamas' Oct. 7 attack out of Gaza ignited the war.

The “last warning” proposal, presented by Trump's Mideast envoy, Steve Witkoff, calls for a negotiated end of the war and the withdrawal of Israeli forces from Gaza once the hostages are released and a ceasefire is established, according to officials familiar with the talks.