* July 2009 – Attacks and clashes in Bauchi and Maiduguri leave 800 people dead.

* December 2010 – Bombings in central Nigeria and church attacks in the northeast kill 86 people.

* June 16, 2011 – Car bomb kills two outside police headquarters in Abuja.

* June 26, 2011 – Attack on a bar in Maiduguri kills 25 people.

* August 25, 2011 – Attacks on a police station in Gombi and two banks leave 12 people dead.

* August 26, 2011 – Suicide bomber kills 23 people at the U.N. building in Abuja.

* November 4, 2011 – Bombings in Damaturu and Potiskum kill 65 people.

* December 25, 2011 – Christmas Day bombings across Nigeria kill 39 people.

* January 10, 2011 – Gunmen open fire on a bar in Yobe state, killing eight people.