At least 100 people have died after the Sudanese paramilitary Rapid Support Forces raided a community in al-Jazira State.
Sudan's top United Nations official asked for an inquiry into the event in Wad al-Noura village, central Sudan.
"Even by the tragic standards of Sudan's conflict, the images emerging from Wad Al-Noura are heart-breaking," said U.N. Humanitarian Coordinator Clementine Nkweta-Salami.
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She referenced photographs posted on social media by the Wad Madani Resistance Committee, which has been documenting similar assaults, depicting scores of bodies prepared for burial.
The committee said that 104 people had been killed and hundreds injured in Wad al-Noura and that the RSF was moving on to neighboring communities.
"Wad alnoura village ... witnessed a genocide on Wednesday after the RSF attacked twice," the committee said in a statement.
If true, the raid would be the largest in a series of hundreds of attacks by RSF forces on tiny communities around the agricultural state since the group took control of the capital, Wad Madani, in December.
A telecommunications outage prohibited Reuters from contacting medics or people to confirm the information.
After disagreements over the unification of the two forces, the RSF began battling with the army in April 2023 and has since gained control of the capital, Khartoum, and most of western Sudan. It is now attempting to push into the center, while United Nations agencies warned that Sudan's people face an "imminent risk of famine."
In a statement issued Wednesday, the RSF stated that it had struck army and allied militia sites near Wad al-Noura but did not admit any civilian casualties.
The Wad Madani Resistance Committee accused the RSF on Wednesday of employing heavy artillery on people, plundering, and forcing women and children to seek sanctuary in the adjacent town of Managil.
The army-aligned Transitional Sovereign Council denounced the attack.
