CAIRO (AP) — The United Nations' top official in Yemen warned Monday that the Arab world's poorest country will remain a powder keg for renewed war unless its rival factions work out a new cease-fire deal.

Hans Grundberg, the U.N. special representative for Yemen, told The Associated Press the situation in the conflict-stricken country is fragile nearly a year after the internationally recognized government and the Iranian-backed Houthi rebels .

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