While the genocide in Rwanda has been widely recognised, another massacre which took place in the neighbouring Democratic Republic of Congo in 1996 has gone largely unnoticed by the international community.
In 2010, UN investigators reported that hundreds of women and children were killed by both Rwandan and Congolese Tutsi militia.
Activists say that not recognising the killings risks spurring more violence.
Al Jazeera's Malcolm Webb reports from Rutshuru in the DRC.
Some viewers may find the images in this report disturbing.