Nigeria un bomb 2011 10 3

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Nigeria braces for more extremist violence

Killing of parliamentarian highlights increasing aggression of Boko Haram.

Nigeria: "At least 50" dead in Boko Haram clashes

Nigerian troops are battling Islamist militants in the country's northeast.

Nigeria: Christmas church bombs kill dozens

Five bombs exploded in Nigeria at churches on Christmas.

Rescue workers evacuate on August 26, 2011 a wounded man from the UN building of the Nigerian capital Abuja which was rocked by a bomb that killed at least 18 people, leaving others trapped and causing heavy damage. The attack by radical Islamist sect Boko Haram marked a significant escalation in the violence.

Henry Chukwuedo

AFP/Getty Images