As of the publishing of this article, you also forgot Chad, Cameroon, and Senegal too. And I believe they are also trying to get a foothold in other nearby nations too:
http://www.ibtimes.co.uk/boko-haram...urqas-fearing-their-use-by-terrorists-1529552
http://www.ibtimes.co.uk/boko-haram...urqas-fearing-their-use-by-terrorists-1529552