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.

Rwandan-backed M23 rebels in Democratic Republic of Congo are seeking to advance south towards Bukavu, the capital of South Kivu province, in an attempt to expand their area of control in the country's east after capturing the city of Goma.

The Democratic Republic of Congo (DRC) has severed diplomatic ties with Rwanda, accusing it of fuelling the rebellion. At least 13 soldiers serving with peacekeeping forces in the DRC have been killed in clashes with M23 rebels,

The latest fighting has intensified a humanitarian crisis, displacing more than 400,000 people since the start of the year, and raised fears of sparking a regional war, the U.N. has warned.

GOMA, Democratic Republic of Congo (Reuters) -Congolese rebels said on Sunday they had taken Goma, the biggest city in the east of the mineral-rich country, after a lightning advance that has forced thousands of people to flee and fuelled concerns of a regional war.

Authorities in the Democratic Republic of the Congo (DRC) have reported that at least 773 people have been killed in Goma, the largest city in the country's east, and surrounding areas within a week due to ongoing clashes with M23 rebels,