The United Nations told some 3,300 Afghan staff not to come to work in Afghanistan for the next two days after the Islamic Emirate authorities signaled on Tuesday that they would enforce a ban on Afghan women working for the world body, Reuters reported.

UN officials in Afghanistan "received word of an order by the Islamic Emirate authorities that bans female national staff members of the United Nations from working," UN spokesperson Stephane Dujarric told reporters in New York.

The UN is looking into impacts and will meet with Afghan foreign ministry officials in Kabul on Wednesday to seek further clarity, he said. About 400 Afghan women work for the UN, read the report.

Two UN sources told Reuters that concerns over enforcement had prompted the organization to ask all staff - male and female - not to come to work for 48 hours. Friday and Saturday are normally weekend days in Afghanistan, meaning UN staff would not return until Sunday at the earliest.

The UN mission in Afghanistan (UNAMA) earlier on Tuesday expressed concern that female staff in the eastern province of Nangarhar had been stopped from reporting to work.

"There was a much more official communication made in (Nangarhar provincial capital) Jalalabad. We were told through various conduits that this applied to the whole country," Dujarric, adding there was nothing writing.

"Female staff members are essential for the United Nations to deliver life-saving assistance," he said, adding that some 23 million people - more than half Afghanistan's population - need humanitarian aid.

The Islamic Emirate of Afghanistan (IEA) administration and the Afghan information ministry did not immediately respond to requests for comment, Reuters reported.

UN Secretary-General Antonio Guterres condemned the ban enforcement in Nangarhar, posting on Twitter: "If this measure is not reversed, it will inevitably undermine our ability to deliver life-saving aid to the people who need it."

The IEA administration, which seized power as US-led forces withdrew from Afghanistan after 20 years of war, says it respects women's rights in accordance with its strict interpretation of Islamic law.

Since toppling the Western-backed government in Kabul, the IEA have tightened controls over women's access to public life, including barring women from university and closing most girls' high schools, Reuters reported.

In December, IEA authorities stopped most female humanitarian aid employees from working, which aid workers say has made it more difficult to reach women in need and could lead donors to hold back funding.

The restrictions did not initially apply to the UN and some other international organizations. In January, UN Deputy Secretary-General Amina Mohammed flagged concerns that authorities could next restrict Afghan women working at international organizations.

It was not immediately clear whether foreign embassies in Kabul had received similar instructions on female staff.

A ban on Afghan female UN workers could pose major challenges to continued UN operations in Afghanistan. The founding UN Charter states that no restrictions be placed on the eligibility of men and women to work for the UN.

Aid officials have also flagged the risk that donor countries will reduce funding due to frustration over restrictions on women as other international crises take hold, Reuters reported.

The UN has made its single-largest country aid appeal ever, asking for $4.6 billion in 2023 to deliver assistance in Afghanistan. So far it is less than 5% funded.