Israel has systematically obstructed food entering Gaza, aid agencies say, as a UN-backed body confirms a famine.

A United Nations-backed body declared a famine in Gaza for the first time since the Israel-Hamas war broke out almost two years ago, a finding likely to intensify international calls for a ceasefire and accelerated delivery of aid.

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An announcement of famine — as has now happened regarding Gaza — is a complicated decision. Here's what must be considered before such a declaration is made.

The Integrated Food Security Phase Classification, or IPC, said famine is happening in Gaza City, home to hundreds of thousands of Palestinians.