Boko Haram
Major attacks blamed on Nigeria's Boko Haram2009
- July - Attacks prompt government crackdown in Bauchi and Maiduguri; 800 people killed
2010
- December - Bombings in central Nigeria and church attacks in the northeast kill 86
2011
- June - Attack on a bar in Maiduguri kills 25
- August - Suicide bomber kills 23 at U.N. building in Abuja
- November - Bombings in Damaturu and Potiskum kill 65
- December - Christmas Day bombings across Nigeria kill 39
2012
- January -- Gun and bomb attacks in Kano kill up to 200
- February - Maiduguri market attack kills 30
- June - Suicide car bombings at three churches kill 21
- July - Attacks in Plateau state kill dozens, including two politicians at a funeral for the victims
2013
- February - French family kidnapped in Cameroon, held hostage for two months
- April - Fighting with troops in Baga kills up to 200; residents say troops set deadly fires
- May - Attacks in Bama kill more than 50
- July - Gunmen kill 30 at a school in Yobe
- August - Gunmen kill 44 at a mosque outside Maiduguri
- September - Gunmen kill 40 students a dorm in Yobe
- October - Attack Yobe state capital Damaturu, clash with military in Borno state
Military officials say commander Momodu Bama died in a gunbattle earlier this month in the country's northern region.
There has been no confirmation of the commander's death from the militant group.
On Monday, a new video emerged by Boko Haram's self-declared leader, Abubaker Shekau.
He claimed responsibility for several recent attacks and urged Nigerians to abandon the country's constitution and accept Islamic law.
The group has been fighting to impose a strict form of Sharia on the country's Muslim-majority north.
Boko Haram has been blamed for thousands of deaths since it launched an uprising against the government in 2009.