No fewer than four persons have been killed by a suspected female suicide bomber in Maiduguri, the Borno State capital.
Those killed included a policeman, who attempted to stop the female suicide bomber for questioning.
The incident occurred at the Musa Usman Secretariat of the Borno State Government.
The explosion was said to have occurred at about 11:30am on Thursday.
No fewer than 20 persons were injured in the explosion.