Palestinians are marking 76 years of dispossession on Wednesday, commemorating their mass expulsion from what is today Israel, as a potentially larger catastrophe unfolds in Gaza where more than half a million of people have been displaced in recent days by fighting.

Israel has been pressing its military operations in Rafah, a city along Gaza’s southern border with Egypt, and in northern Gaza, where Hamas has regrouped. Around 450,000 Palestinians have been driven out of Rafah over the past week, the U.N. agency for Palestinian refugees said Tuesday. In northern Gaza, Israeli evacuation orders have displaced at least 100,000 people so far.

Some 80% of Gaza’s population of 2.3 million Palestinians have fled their homes since the start of the war, with many relocating multiple times.

No food has entered the two main border crossings in southern Gaza for more than a week. Some 1.1 million Palestinians are on the brink of starvation, according to the U.N, while a “full-blown famine” is taking place in the north of the territory.