The massacre took place in Yumbi, a town on the banks of the Congo River, and in several surrounding villages. Most of the people in this area are from the Batende community. The largest minority group is the Banunu. According to Gentiny Ngobila, the governor of Mai-Ndombe province, an estimated 200,000 people live in and around Yumbi, with about 40,000 living in the town itself.
In late December, several photos, seemingly taken in Yumbi during the massacre and in the days following, started circulating on social media. However, it was difficult to verify their origin, especially because there was an internet blackout in the country, which lasted from December 31 – the day after the presidential election – through January 19.