Lowcock deplored the fact that the Red Sea Mills in Hudaydah has been inaccessible since fighting escalated around them in September.

Fighters have regularly impinged upon the compound, and the site was repeatedly struck by mortar fire. Early last month, the mills came under the control of government-backed forces. But access since then has been hampered by difficulties in moving across front lines and concerns that the area -- potentially including the entrance to the mills -- may have been mined.

"Because of all this, enough food to feed 3.5 million people for a month has now sat useless in a warehouse for more than three months. ... As of today, we have no idea if the Red Sea Mills can still operate or how much of the donor-funded grain has been damaged or spoiled."

The Red Sea Mills are just one site among a very large number of mills, silos and warehouses located in and around Hudaydah. If these sites are hit or damaged, aid operations could very quickly grind to a halt, he warned.

That is why the agreement to end conflict in Hudaydah is so important, he noted.

Lowcock also asked the rebel authorities in Sanaa to honor their commitments of lifting restrictions and bureaucratic impediments to humanitarian aid organizations, including delays in visas and customs, NGO registration, and unacceptable interference with humanitarian operations.

Lowcock appealed for funding of the UN response plan for Yemen as the world organization has to expand its operations.

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