The United Nations on Tuesday condemned a deadly attack on a displacement camp in Sudan’s North Darfur that it said killed at least 40 civilians, warning that the regional capital El Fasher is now under a siege that has cut off aid.

U.N. spokesman Stéphane Dujarric said local sources attributed Monday’s large-scale assault on the El Fasher area and the adjoining Abu Shouk camp for internally displaced persons (IDPs) to the paramilitary Rapid Support Forces (RSF).

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In addition to the 40 civilians reported killed within the camp, another 19 were injured, the U.N. said.

Sheldon Yett, the U.N.’s acting humanitarian coordinator for Sudan, issued a sharp rebuke of the violence.

“I unequivocally condemn all deliberate and indiscriminate attacks on civilians in the country,” Yett said in a statement. “Displacement camps and other places of refuge for civilians must not be targeted. All parties to conflict have a clear obligation under international humanitarian law to ensure the protection of civilians.”

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The attack has worsened an already desperate humanitarian situation, with the U.N. reporting that exit routes from El Fasher have been blocked, trapping civilians.

“Those that are trapped in those areas are facing acute hunger and starvation,” Dujarric told reporters.

The U.N. reiterated calls for a humanitarian pause to allow for the delivery of life-saving supplies and demanded “safe and unhindered passage” for people seeking to flee the fighting.

The International Organization for Migration (IOM) said the recent violence has displaced at least 500 people from the Abu Shouk camp.

The U.N. also highlighted deteriorating conditions in Sudan’s South Kordofan state, where it said more than 3,000 people fled the town of Kadugli earlier this month due to intensified insecurity that has severed supply routes.