Lava from the eruption of Mount Nyiragongo cuts through Buhene north of Goma, Congo Monday, May 24, 2021. Residents returned to destroyed homes and searched for missing loved ones on the outskirts of Goma as officials called for vigilance amid small tremors after the large volcano erupted Saturday May 22, 2021 .  Mount Nyiragongo sent torrents of lava into villages after dark with little warning, leaving at least 15 people dead amid the chaos and destroying more than 500 homes. (AP Photo/Justin Kabumba)

Lava from the eruption of Mount Nyiragongo cuts through Buhene north of Goma, Congo Monday, May 24, 2021. Residents returned to destroyed homes and searched for missing loved ones on the outskirts of Goma as officials called for vigilance amid small tremors after the large volcano erupted Saturday May 22, 2021 .  Mount Nyiragongo sent torrents of lava into villages after dark with little warning, leaving at least 15 people dead amid the chaos and destroying more than 500 homes. (AP Photo/Justin Kabumba)

Lava from the eruption of Mount Nyiragongo cuts through Buhene north of Goma, Congo Monday, May 24, 2021. Residents returned to destroyed homes and searched for missing loved ones on the outskirts of Goma as officials called for vigilance amid small tremors after the large volcano erupted Saturday May 22, 2021 .  Mount Nyiragongo sent torrents of lava into villages after dark with little warning, leaving at least 15 people dead amid the chaos and destroying more than 500 homes. (AP Photo/Justin Kabumba)

People gather on a stream of cold lava rock following the overnight eruption of Mount Nyiragongo in Goma, Congo, Sunday, May 23, 2021. The volcano unleashed lava that destroyed homes on the outskirts of Goma but the city of nearly 2 million people was mostly spared after the nighttime eruption. Residents of the Buhene area said many homes had caught fire as lava oozed into their neighborhood. (AP Photo/Clarice Butsapu)

People gather on a stream of cold lava rock following the overnight eruption of Mount Nyiragongo in Goma, Congo, Sunday, May 23, 2021. Witnesses say Congo’s Mount Nyiragongo volcano unleashed lava that destroyed homes on the outskirts of Goma but the city of nearly 2 million was mostly spared after the nighttime eruption. Residents of the Buhene area said many homes had caught fire as lava oozed into their neighborhood. (AP Photo/Justin Kabumba)