Q. Find source of statement: nine out of ten countries at risk for conflict are found in Africa.

See http://www.genocidewatch.org/alerts/countriesatrisk2012.html

For historical context:
Nine of the ten conflicts with the highest death tolls that took place in the 1990s occurred in Africa.49
http://www.cissm.umd.edu/papers/files/deathswarsconflictsjune52006.pdf (footnote 49, p. 15)

Nine of the ten countries with the lowest Human Development Indicators have experienced conflict in the last 20 years.
http://www.un.org/sg/statements/?nid=5086