Nearly three thousand people have been killed in the city of Goma in the eastern Democratic Republic of Congo, according to the United Nations, after the provincial capital was captured by rebels following days of fierce fighting with the Congolese army.

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.