The UN regained access to donated grain stored in the Yemeni port city of Hodeidah on Sunday, and began the task of salvaging food that could stave off starvation for millions of citizens before it rots.

Hodeidah, which has become the focus of a four-year war between government forces and the Iran-backed Houthis, is the entry point for most of Yemen’s humanitarian aid and commercial imports.

But World Food Program (WFP) grain stores there have been cut off for eight months, putting 51,000 tons of wheat at risk of rotting. The stores came under the control of government forces after fierce battles last year but a major frontline is only a few blocks away.

A WFP technical team arrived in the eastern outskirts of Hodeidah on Sunday to begin cleaning and servicing equipment in preparation for milling grain, a WFP spokesman told Reuters. 

Sources familiar with the matter said the WFP-led team traveled from the government-held southern port city of Aden along the western coast, avoiding Houthi-held areas after the group denied them access from the north, which it controls.

Houthi militants did not immediately respond to a Reuters request for comment. The Houthis and the government of Abed Rabbo Mansour Hadi agreed in December to a UN-sponsored truce and troop withdrawal from Hodeidah. That deal has largely held but violence has escalated in some other parts of the country.

WFP spokesman Herve Verhoosel said its priority was to begin cleaning and servicing milling machinery and fumigating the wheat.

The UN expects that process to take several weeks before starting to mill it into flour and distributing it to the Yemeni communities most in need.

An assessment carried out in February, when the UN was briefly granted access to the mills for the first time since September, concluded that around 70 percent of the wheat may be salvageable.

But the flour yield will be lower than normal as weevil infestation has caused hollow grains, the UN said, based on that assessment.

Talks aimed at securing a mutual military withdrawal from Hodeidah have stalled despite UN efforts.

Yemeni government officials accuse the Houthis of violating the peace deal.

Under the proposed withdrawal, a government retreat would free up access to the Red Sea Mills and humanitarian corridors would also be reopened. 

The warring sides would still need to agree on which road could be used to transport supplies from the site to recipients.