In July 2018 a horrifying video began to circulate on social media. It shows two women and two young children being led away at gunpoint by a group of Cameroonian soldiers. The captives are blindfolded, forced to the ground, and shot 22 times.

The government of Cameroon initially dismissed the video as “fake news.” But BBC Africa Eye, through forensic analysis of the footage, can prove exactly where this happened, when it happened, and who is responsible for the killings.

Investigation by Aliaume Leroy and Ben Strick. Produced by Daniel Adamson and Aliaume Leroy. Motion Graphics: Tom Flannery

This story won an RTS award in February 2019. The judges said it was "a superb piece of public interest journalism which held power to account and had a huge impact in social media."