A report released by HRW details the massacre of ethnic Masalit in Ardamata, West Darfur between 4-8 November.
The report, based on witness and survivor accounts, includes accounts of men being hacked to death and left for days on the streets after the RSF and allied militias took over an army base.
At least 800 people were killed as RSF forces came close to taking over Darfur from Sudanese army forces in early November.
Many victims of the fighting were in displacement camps around a state military base.
HRW says the acts amount to war crimes and comes four months after similar attacks and reports of over a dozen mass graves in west Darfur.
Aljazeera.