UN special envoy Ismail Ould Cheikh Ahmed is in Sana'a to try to bring all sides of the Yemen crisis to the negotiating table.

Meanwhile, a five-day humanitarian ceasefire has come into force in Yemen, just hours after Arab coalition fighter jets struck Houthi fighters and their allies.

Coalition spokesman Ahmed al-Assiri said Saudi Arabia is committed to the truce, but will continue monitoring the rebels through intelligence and reconnaissance flights.

The UN relief agencies are ready to bring in emergency food, blankets, plastic sheeting and other vital supplies to hundreds of thousands of Yemeni civilians.

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