June 10 (Reuters) - Militants attacked two churches in north and central Nigeria on Sunday, spraying the congregation of one with bullets, killing several people, and blowing up a car in a suicide bombing at the other.

The Islamist group Boko Haram, which says it is fighting to reinstate an Islamic caliphate in mostly Muslim northern Nigeria, has stepped up deadly bombings and shootings against Christian places of worship this year.

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