Some churches in northern Nigeria, usually packed with worshippers, were almost empty on Sunday morning and many people stayed away in other parts of the country after a week of violence in religiously-mixed Kaduna state.

At least 92 people were killed in the tit-for-tat attacks between Muslims and Christians in Kaduna last week, sparked by suicide bombings at three churches last Sunday that killed 19 people and were blamed on Islamist sect Boko Haram. ...