Belfast City Hall cannot confirm whether or not a planned illumination of its building today to mark International Safe Abortion Day will go ahead.
The National Women's Council (NWC), an all-island body, has expressed its "deep disappointment" over what it believes is the halting of the planned illumination.
A vote to illuminate the Belfast City Hall building, in solidarity with Safe Abortion Day, was voted on and passed by the council in August.
International Safe Abortion Day is a global event commemorated by the United Nations and World Health Organization as well as national governments.
This year is the first year that Ireland plans to take part in a European-wide initiative to illuminate buildings in green.
Trinity College Dublin and the Mansion House in Dublin will be lit up today.
The European-wide initiative will also see buildings lit up in green in London, Barcelona, Paris, Brussels, Edinburgh and more.
Belfast City Hall was also due to light up in green to mark the day.
Although the council voted by majority to illuminate the City Hall building, the decision was subsequently "called in" pursuant to the Local Government Act (NI) 2014.
This requires the Council to seek a legal opinion, and then elected members must consider appropriate next steps depending upon the findings of the legal opinion.
The NWC understood that this was not possible to do by today.
Corrinne Hasson, executive director of NWC, said the council was "deeply disappointed".
"The illumination would have sent a strong message to women in Northern Ireland that their right to access safe healthcare is being recognised," Ms Hasson said.
