March 3: Three people are killed and 21 injured by an explosive device thrown from a car at an election rally near Nigeria’s capital, Abuja.
April 7: An explosion hits a polling booth at Unguwar Doki, Maiduguri, Borno State injuring more than 10 people.
April 8: Bomb explosion at the Independent Electoral Commission office in Suleja, kills 11.
April 9: An explosion hits a polling booth in a neighbourhood of the northeast Nigerian city of Maiduguri during a parliamentary election.
April 15: Youths riding on a motorcycle, throw a locally made bomb into the premises of the Maiduguri council office of the INEC.
April 16: A police station in the Lami Sula district of Maiduguri, which lies in the remote state of Borno near Nigeria’s borders with Chad, Cameroun and Niger Republic, is bombed.
April 16: Bomb explosion occurs in two separate areas of Kaduna metropolis on the night of the presidential election in the state.
April 21: Two suspected bomb-makers die in a blast in Kaduna.
April 25: Three bomb blasts rip through a hotel and a motor park in Maiduguri killing at least two persons.
May 29: 13 people are confirmed dead and 40 injured in a night blast at mammy market located in Shandawanka Barracks, Bauchi, the Bauchi State capital.
May 29: Eight victims lose their legs after an explosion occurred at Zuba, a suburb of Kubwa in Abuja.
May 31: Bomb explosion near bank on Baga Road in Maiduguri, the Borno State capital.
June 16: Boko Haram carries out massive bomb attack on Force Headquarters (also known as Louis Edet House), Abuja, targeted at the Inspector-General of Police. Officials believe it is the first suicide bombing in Nigeria’s history.
August 26: Boko Haram bombed the UN House, Abuja killing over 20 people.
November 11: Explosion in Bauchi left five people injured
See more here:
Timeline of 2011 explosions