The medical charity Médecins Sans Frontières (MSF) says more than half a million people in the east of the Democratic Republic of Congo have lost their supply of drinking water as a result of the recent volcanic eruption.

MSF said because cholera was endemic and posed a great threat there was an urgent need to provide people in the city of Goma with safe drinking water.

A reservoir and pipes were damaged when one of the world's most active volcanoes - Mount Nyiragongo - erupted 10 days ago.

Since then there have been many tremors and hundreds of thousands of people are still unable to return to their homes, and in need humanitarian assistance.