Fighting last week between government forces in the Democratic Republic of the Congo and Rwanda-backed rebels in the major eastern city of Goma left at least 900 people dead, the UN health agency has said.

Heavy artillery fire and gunshots echoed through the besieged Congolese city of Goma on Monday as DR Congo forces battled militia fighters and Rwandan troops, while Kigali said five civilians were killed across the Rwandan border.