Food aid for Yemen war affectees is at risk of rotting in a warehouse, the United Nations said on Monday.
The food aid is in the western port city of Hodeida, Yemen.
According to reports, enough grain is to feed 3.7 million people for a month.
The granary has remained off-limits to aid organisations for months leaving millions of Yemenis without access to life-saving sustenance.
More than 10 million Yemenis stand at the brink of starvation.
The United Nations Yemen envoy Martin Griffiths said, the rebels had made efforts to re-open the road leading to the mills.
Martin Griffiths secured a ceasefire agreement in December for Hodeida between the Iran-backed rebels and Saudi-led coalition.
The Yemen war has killed around 10,000 people since 2015.
Human Rights groups estimate the toll is significantly higher.