Israel’s military operation in the Gaza Strip is expanding to seize “large areas,” the defense minister said Wednesday, as airstrikes on the southern city of Khan Younis killed 17 people overnight, according to hospital officials.

One Israeli strike killed at least 17 people in a United Nations building, previously a clinic, that had been converted into a shelter for more than 700 displaced people.

Palestinians in the Gaza Strip, meanwhile, report finding it harder to find food amid bakery closures. Israel says enough food entered Gaza during a six-week ceasefire with Hamas to sustain the territory’s roughly 2 million Palestinians for “a long period of time.”