The Israel-Hamas war is expected to ramp up with a looming Israeli ground invasion of Gaza, where a humanitarian crisis is deepening. Israel has pounded the Palestinian territory with airstrikes since Hamas militants fired barrages of rockets and stormed into the Jewish state on a murderous rampage last weekend.

In an interview with "60 Minutes," President Biden said "Israel has to respond. They have to go after Hamas," but warned that an Israeli occupation of Gaza would be "a big mistake."

The U.N. said almost a million Gaza residents have been displaced since the war started, with many following Israel's warning to flee to the southern half of the territory as food, water and fuel run short.

The only exit from Gaza, the Rafah border crossing into Egypt, remained closed Monday. Both Israel and Hamas denied reports of a temporary ceasefire in Gaza to enable humanitarian aid to enter in and foreigners to evacuate at the Rafah crossing.

The death toll on both sides of the war continues to climb. Israel's military said Hamas' attack and ongoing rocket fire from Gaza has killed more than 1,300 people, including at least 276 troops, and injured 3,200 others. In Gaza, the Health Ministry said Monday that Israeli airstrikes have killed at least 2,750 people and wounded at least 9,700.

The death toll includes 30 U.S. citizens, a State Department spokesperson confirmed Sunday, and 13 Americans remain unaccounted for.

The Israeli military said Sunday it has confirmed 155 people were taken captive by Hamas. A number of Americans are believed to be among them.

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