ABUJA (Reuters) - Nigeria’s presidential election set for Saturday could be delayed in parts of the country, two diplomats and a government source said on Friday, citing difficulties in transporting electoral materials in some areas.

The Independent National Electoral Commission was holding a late night meeting and could not immediately be reached for comment.

President Muhammadu Buhari faces a tight election contest in Africa’s biggest economy, top oil producer and most populous nation against the main opposition candidate, former vice president and businessman Atiku Abubakar.