JERUSALEM (AP) — A key mediator on Tuesday stressed the urgency of brokering a ceasefire in the Gaza Strip after Hamas showed a “positive response†to a proposal from Arab countries, but Israel has yet to weigh in as its military prepares an offensive in some of the territory's most populated areas.

The prospect of and other areas sheltering hundreds of thousands of civilians has sparked international outrage. Palestinians say there is nowhere to flee after 22 months of war that has already killed tens of thousands and destroyed much of the territory.

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