Both sides agreed on Sunday to extend a much-violated truce by 72 hours, and the UN told Reuters the rival forces may hold ceasefire talks in Saudi Arabia.
This has created an extraordinary obstacle for humanitarian workers and nongovernmental organizations in attempting to provide aid to those who need it.
The army and RSF said earlier they had agreed to a new three-day ceasefire through Sunday to replace one that expired on Thursday night.
This week, Israel offered to host peace talks between Sudan’s two warring generals, a proposal that would have been unthinkable a few years ago.
UNHCR officials are poised for 270,000 people to flee over Sudan's borders - a preliminary planning figure that includes Sudanese refugees crossing into South Sudan and Chad.
The WHO's Nima Saeed Abid said technicians were unable to access the National Public Health Laboratory to secure the biological materials.
Cohen said he hoped that working to achieve calm in Sudan "would allow for the signing of a historic peace agreement."
The embassy closure comes amid a power struggle and violence, threatening democratic progress in the Sudan.
It is now clear that key countries linked to the West are all concerned that fighting may grow worse and access to basic things such as medical services and even clean water may be an issue.
Many countries have an interest in a ceasefire in Sudan yet it doesn't seem like they are willing to invest in ensuring that one holds.
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