Why can't Nigeria's defence forces end insecurity in central and northern areas?

Nigeria's defence minister talks about Boko Haram attacks in the northeast and separate inter communal mass killings in central and northwestern parts of the country. Plus German chancellor, Angela Markel, is in Ghana to discuss migration and investment. And Congolese ex-warlord, Bosco Ntaganda, tells the International Criminal Court in the Hague, he is a 'revolutionary,' not a criminal.

(Image: Nigeria's defence minister, Mansur Dan Ali. Credit: BBC)