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In Rwanda in 1994 at least 800,000 people were killed when members of the majority Hutu tribe turned on the minority Tutsis.
Since then the country has been trying to come to terms with the aftermath of the violence that has left victims and perpetrators living side by side in the same villages.
The slow painful process is powerfully revealed in a new film called My Neighbour, My Killer.
The filmmaker Anne Aghion spent ten years working in one small community in Rwanda.
She followed the work of the local 'gacaca' courts - where survivors of the genocide confront those they believe are responsible for violence against them and their families.
Anne was given an award for courage in filmmaking by the campaign group Human Rights Watch.
And she recently screened the film for the first time in Kigali - to an audience which included many of the people it featured.
Matthew Bannister spoke to Anne Aghion and asked her all about her experiences of the painful process of reconciliation in the Rwanda community she visited.
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