Saudi Brig Gen Ahmed Asiri's comments, posted today on the website of the semi-official Saudi newspaper al-Riyadh, cast doubt over the fragile truce that begin at midnight yesterday.
Asiri said the coalition is not interested in a unilateral truce, calling it "counterproductive." He added that the coalition is not bound to it because of a lack of commitment by the Shiite rebels known as Houthis. He called for UN observers on the ground to monitor for violations.
Saudi-led coalition airstrikes hit at least six provinces today as fighting on the ground continued in at least four provinces.
Meanwhile, the World Health Organization today said the truce will allow it and other groups to provide aid.
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The UN declared its highest-level humanitarian emergency in Yemen on July 1. The UN humanitarian office says Yemen is on the brink of famine.
Yemen, the Arab world's poorest country, relies on imports for the bulk of its food and fuel, but the coalition has imposed a near-complete air and sea blockade during the fighting.