Several hours ago, during local overnight, Mount Nyiragongo in the Democratic Republic of the Congo began to erupt. A video shows a neighborhood in the nearby town of Goma being inundated with lava:
This volcano is known for being one of the few in the world that, like Kilauea until recently, contains a persistent lava lake in its crater. But the volcano has erupted a few times in the past, most recently in 2002. In that eruption, lava also reached Goma; I guess we have to wait until local daylight for authorities to establish the extent of the current eruption.
There is concern that if lava enters Lake Kiva, whose deeper waters are over-laden with carbon dioxide and methane, that it could cause a lethal overturn where
all of the CO2 erupts from the lake suddenly and a giant gas bubble settles over the surrounding area, suffocating everyone. Some lava entered the lake during the 2002 eruption and did not cause such an overturn; but the concern still exists if this eruption is more productive and more lava enters the lake.