The U.N.
Is warning of a complete humanitarian collapse in Gaza as Israel continues its assault on the southern portion of the strip, where civilians had initially been told to flee.
Charlie D'Agata reports.
António Guterres Invokes Rarely Used Power to Demand Cease-Fire in Middle East
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António Guterres Invokes Rarely Used Power , to Demand Cease-Fire in Middle East.
The U.N. secretary-general invoked..