LONDON — The “worst-case scenario of famine” is unfolding in Gaza, according to a warning issued Tuesday by the Integrated Food Security Phase Classification, a global initiative monitoring hunger with the backing of governments, the United Nations and nongovernmental organizations.

“Mounting evidence shows that widespread starvation, malnutrition, and disease are driving a rise in hunger-related deaths,” the IPC warning said. “Latest data thresholds have been reached for food consumption in the Gaza Strip, and for acute malnutrition in Gaza City.”

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