Context: Deir al-Balah had been an informal refuge for Palestinians escaping other parts of Gaza, and huge tent camps have sprung up in the city. The city also hosts warehouses for the U.N. as well as guesthouses for U.N. staff.

The expansion of the 21-month-long offensive into the densely populated area comes as Gaza is in the grip of a humanitarian catastrophe, with the UN warning that Israel’s assault on the territory and restriction of aid deliveries had left its 2.1mn population at risk of famine.