Democratic Republic of Congo's opposition said Monday it expects one of its candidates to win the presidential election based on early vote tallies, but the ruling coalition said it was confident its candidate had won the chaotic contest.

The competing claims followed a disorderly election day Sunday in which many Congolese were unable to vote due to an Ebola outbreak, conflict and logistical problems.

The vote is meant to choose a successor to outgoing President Joseph Kabila after 18 years in power and could lead to the vast central African country's first ever democratic transition.