Boko Haram, whose name means “Western education is forbidden”, is fighting to overthrow the government and create an Islamic state.
On Sunday, a church was bombed, leaving eight people dead in Kaduna, one of the cities affected by the conflict. Although Boko Haram has not said it carried out the attacks, it has claimed responsibility for similar bombings across northern and central Nigeria.
Obadiah Diji, youth leader of the Christian Association of Kaduna, gave the BBC an account of how life has changed in the city.
Muslims live in areas where there is a Muslim majority; Christians where there is a Christian majority. So, the two groups lead separate lives, with little social contact.
It was not always like this. We once took pride in the fact that Kaduna was cosmopolitan and welcoming of everyone.
Although there were differences, Christians and Muslims lived together. We were in an out of each other’s homes. Our children went to the same schools, learning from each other about their respective religions and cultures.