Mahmood Yakubu, chairman of the Independent National Electoral Commission (INEC), says there were attempts to sabotage the commission during preparations for the elections.
He said this in Abuja while explaining the reason for the postponement of the general election.
The presidential and national assembly elections had been shifted by seven days, while the governorship and state assembly polls were slo shifted by a week.
Yakubu said the postponement was not as a result of incompetence, security lapse or political interference.
He listed the fire incidents in Abia, Plateau and Anambra states, saying the commission did its best to make sure that the challenges were tackled.