More than 200 people were killed when a coltan mine collapsed in Rubaya, eastern Congo’s North Kivu province. The mine, located about 60 kilometers northwest of the provincial capital Goma, caved in on Wednesday. Reuters reported that the exact number of casualties has not yet been confirmed.

Lumumba Kambere Muisa, spokesperson for the M23 rebel-appointed governor of North Kivu, said some people were rescued in time after the collapse, while others were seriously injured. Around 20 injured individuals are receiving treatment at a local health center. Iraston Bahati Musanga, the M23-appointed governor, told AFP on Friday that several bodies had been recovered but did not specify the total number of victims.

A provincial adviser, speaking anonymously to Reuters, estimated the death toll at over 200. Miner Frank Bolingo said many people were still believed to be trapped inside the mine, indicating that rescue operations were continuing.