The International Criminal Court (ICC) is taking steps to preserve evidence of potential war crimes in Sudan’s Darfur region after the Rapid Support Forces (RSF) captured the city of El-Fasher, reportedly killing hundreds of civilians.

Witnesses described house-to-house killings and sexual assaults, and the World Health Organization reported at least 460 people killed at a hospital, with doctors and nurses abducted.

The ICC said the alleged atrocities are part of a broader pattern of violence in Darfur that may constitute war crimes or crimes against humanity.

RSF’s takeover marks a new phase in the two-year conflict between Sudan’s military and the paramilitary group, ABC News has reported.

Earlier this month, the ICC secured its first conviction for Darfur atrocities, sentencing Ali Muhammad Ali Abd–Al-Rahman, known as Ali Kushayb, for ordering mass executions and killing prisoners with an ax.