Authorities announced on Thursday magma was detected under the urban area of Goma, suggesting a second eruption could be on the table.
Lt. Gen. Constant Ndima Kongba, the military governor of Congo’s North Kivu province, warned an eruption could go off at any moment.
He said: “Based on these scientific observations, we cannot currently rule out an eruption on land or under the lake.
“And this could happen with very little, or no, warning.”
The UN Refugee Agency (UNHCR) reported on Thursday only seven people have been killed by Nyiragongo’s lava flows and another five were suffocated by gas.