Gunmen bombed the headquarters of the electoral commission in Nigeria's southeastern Imo state on Monday and killed a policeman during a gunfight, police spokesman Michael Abattam said.
Elections have in the past been marred by violence in Nigeria, which holds a presidential vote in February to elect a successor to President Muhammadu Buhari, now in his second and final term.
Imo is one of the states in the southeast where gunmen have attacked electoral officials, killed politicians and security agents this year. The government blames the separatist group Indigenous People of Biafra, which has denied the charge.
