Suspected Islamic militants bombed worshipers at three Christian churches on Sunday in northern Nigeria, killing some 23 people. Frustrated with the government's inability to stop a string of such attacks in recent months, some Christians responded today with reprisals, killing at least 7 more people.

More than 150 people, mostly Christians, have been injured from today's violence. Police have not confirmed casualty figures, which are tallies from hospital officials.

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