Boko Haram has waged a decade-long campaign of violence in the country.

The president said in an article on the Christianity Today website that the militants "cannot be allowed to divide good Christians and good Muslims":

Quote Message: It is the reality that some 90% of all Boko Haram's victims have been Muslims: they include a copycat abduction of over 100 Muslim schoolgirls along with their single Christian classmate, shootings inside mosques, and the murder of two prominent imams."

Quote Message: The terrorists today attempt to build invisible walls between us. They have failed in their territorial ambitions, so now instead they seek to divide our state of mind, by pulling us from one from another."

The article was President Buhari's eulogy for Christian leader Rev Lawan Andimi who was abducted and killed by suspected Islamist militants.

 Image caption: Nigeria's president was elected on a promise to defeat the militant group