Nigeria's main opposition challenger Muhammadu Buhari has a slight lead over President Goodluck Jonathan in partial returns from the country's presidential election.
The country's electoral commission late Monday announced vote totals from 18 states and the capital, Abuja. It said Mr. Buhari won 10 states while President Jonathan won eight states and the federal capital territory.
Some of Mr. Buhari's victories came in states in southern Nigeria, which is generally considered a stronghold for President Jonathan.
Election chairman Attahiru Jega said more results will be announced on Tuesday. Another 18 states still have to send results to the counting center in Abuja.