Goma remains “under occupation” by Congo’s M23 rebels and the ceasefire they announced has been broken as their forces engage in heavy fighting along the main route to South Kivu’s main city Bukavu.

The M23 and Rwandan forces on Wednesday launched a new offensive in eastern Democratic Republic of Congo, seizing a mining town in South Kivu province, as they resumed their advance

The rebels said the ceasefire would start Tuesday. The announcement came shortly after the U.N. said 900 people were killed in last week’s fighting in Goma between rebels and Congolese forces.

The rebel group M23 declared a ceasefire in areas under its control in the eastern Democratic Republic of the Congo, citing humanitarian reasons. The streets of Goma were busy as aid groups rushed Tuesday to help the thousands of people wounded and displaced during the past week’s fighting between M23 and pro-Congolese government forces.