Democratic Republic of Congo's M23 rebels are moving south towards Bukavu, the capital of South Kivu province, in what appears to be an attempt to expand their area of control in the country's east after capturing the city of Goma.

Rwanda-backed rebels claimed on Monday they captured eastern Congo’s strategic city of Goma, the hub of a region containing trillions of dollars in mineral wealth that remains largely untapped.

Dead bodies lay in the streets, gunfire rang out and hospitals were overwhelmed in east Congo's largest city on Tuesday, as M23 rebels backed by Rwanda faced pockets of resistance from army and pro-government militias.