JERUSALEM (AP) — The Israeli tanks that entered the periphery of Rafah early Tuesday stoked global fears that an offensive on Gaza’s southernmost city could endanger the more than a million Palestinian civilians sheltering there.

The ground assault dimmed hopes of an immediate cease-fire deal that the U.S., Egypt and Qatar have spent months pushing for. In the hours before the attack began, Hamas agreed to a cease-fire proposal that the Israeli government swiftly rejected.

About 1.3 million Palestinians — more than half of Gaza’s population — are jammed into Rafah and face the prospect of having to evacuate with no good plan for where to find adequate shelter.

Here’s what we know so far about the operation and evacuation plan.

WHERE WILL PALESTINIANS GO?

Now that Israel has begun ordering Palestinians to evacuate parts of Rafah, it is sending them to a patch of land whose current inhabitants say is little more than a makeshift tent camp with squalid conditions.