Burundi, a small country bordering the Democratic Republic of the Congo and Rwanda, is still reeling from decades of civil war that killed more than 300,000 in conflicts between the Hutu majority and Tutsi minority rebel groups. The current government of President Pierre Nkurunziza came to power from the optimism following a UN backed peace plan. However, Nkuranziza, himself a Hutu, has been implicated in complicity with mass killings, assassinations and torture at the hands of his security agents.
Critics have speculated on the willingness of Nkuranziza's administration to comply with the UN commissions, though Arbour has noted an "important consensus" by the Burundi government. Human Rights Watch has suggested further aid to the region be linked to ending impunity.
Burundi has been embroiled in ethnic conflict between the Hutu and Tutsi groups since gaining independence from Belgium in 1962.
There has been no timetable established for the UN commissions.