Goma with Mount Nyiragongo in the background.

Tens of thousands fleeing the Condian town of Goma on Thursday, after authorities warned a second volcanic eruption at one of the most active volcanoes in the world, Mount Nyiragongo.

This magma can reach the surface of Lake Kirvu at any time, said Constant Ndima, the Governor General of the military. When mixed with the lake water a very toxic gas can form.

Constant Ndima Kongba, the military governor of North Kivu province, said magma, the molten rock under Earth’s crust, was discovered under the town and adjacent Kivu Lake.

“Current data on seismicity and the deformation of the ground indicate the presence of magma under the urban area of Goma, with an extension under Lake Kivu,” General Ndmiyah said in a public statement on Thursday morning.

Lava came to a halt just 300 metres short of the Goma airport, the main aid hub to east DR Congo.

While some rushed to Sake, many others crossed the border into Rwanda, where thousands of other people are estimated to have fled after the eruption at the weekend.

A second volcanic eruption at Nyiragongo buried ten residential districts to the east of the city and killed 170 people.

About 100 people were killed in its last big eruption in 2002.

Goma International Airport

Goma International Airport is an airport serving Goma, a city in the Democratic Republic of the Congo in Africa. (wikipedia)

Mount Nyiragongo

Mount Nyiragongo is an active stratovolcano with an elevation of 3,470 m in the Virunga Mountains associated with the Albertine Rift. It is located inside Virunga National Park, (wikipedia)

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Goma

Goma is the capital of North Kivu province in the eastern Democratic Republic of the Congo. It is located on the northern shore of Lake Kivu, next to the Rwandan city of Gisenyi. (wikipedia)