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Hi there from CNN. I'm Krista Bau with the five things you need to know for Tuesday, December 5th.

As Israel expands its offensive in Gaza, top UN officials are warning of an apocalyptic situation there,

as people are left with no safe place to go.

Satellite images show dozens of Israeli armored vehicles now operating in southern Gaza,

an area Israel encouraged Gazans to flee to for safety earlier in the war.

Now Israel's calling on Palestinians in some parts of Southern Gaza to leave, issuing digital

maps that residents say they either don't have access to because of a lack of electricity and internet connectivity or they find them confusing.

CNN's Alex Marquard has more on the humanitarian situation in Gaza.

This adds to an already catastrophic and chaotic situation where you have the vast majority of the 2.2 million population of Gaza now displaced. The UN believes that it is 1.9 million

Gazans who are displaced. Some of them are in shelters, but many are just

camped out wherever they can find safety whether that's in the streets or

...