Sudan's notorious paramilitary group launched a two-day attack on famine-hit camps for displaced people that left more than 100 dead, including 20 children and nine aid workers, in the Darfur region, a U.N. official said Saturday.

The Rapid Support Forces and allied militias launched an offensive on the Zamzam and Abu Shorouk camps and the nearby city of el-Fasher, the provincial capital of North Darfur province, on Friday, said U.N. Resident and Humanitarian Coordinator in Sudan Clementine Nkweta-Salami.

El-Fasher is under the control of the military, which has fought the RSF since Sudan descended into civil war two years ago, killing more than 24,000 people, according to the United Nations, though activists say the number is likely far higher.

The camps were attacked again on Saturday, Nkweta-Salami said in a statement. She said that nine aid workers were killed "while operating one of the very few remaining health posts still operational" in Zamzam camp.

"This represents yet another deadly and unacceptable escalation in a series of brutal attacks on displaced people and aid workers in Sudan since the onset of this conflict nearly two years ago," she said.