One in five people in the Gaza Strip are facing starvation as the entire territory edges closer to famine, a new United Nations-backed report warns, after nearly three months of Israel’s blockade of critically needed humanitarian aid.

The United Nations’ top humanitarian official blasted Israel for “deliberately and unashamedly” imposing inhumane conditions on Palestinians that include the risk of famine.

Israel’s government has publicly dismissed warnings of extreme food shortages after it blocked aid deliveries, but an internal analysis concluded that a crisis looms if food supplies are not restored.