In Sierra Leone, incumbent Julius Maada Bio has been named the victor, but the opposition is contesting the outcome.
According to reported results, Mr. Bio received 56% of the votes. Samura Kamara, his main opposition, was far behind.
Dr. Kamara referred to the outcome as "daylight robbery" following the release of the first round of results on Monday.
President Bio has urged Sierra Leoneans to "keep the peace" despite the tense atmosphere during Saturday's vote.
Dr. Kamara, who ran for office as an All People's Congress (APC) candidate, claims that his electoral agents were not permitted to confirm the ballot tally.
Observers from the Commonwealth and the European Union have drawn attention to issues with the process' lack of transparency.
The APC had voiced criticism of the electoral commission in the lead-up to the election. The commission insisted that it had safeguards in place to guarantee a fair vote, though.
Several violent incidents marred the campaign leading up to the presidential, parliamentary, and local council elections.
The police denied last week's APC claim that one of its supporters had been killed by a police shooting.
When security personnel attempted to disperse the crowd outside the party's headquarters in Freetown on Sunday, the party claims another one of its supporters was killed.
Members of Mr. Bio's party, the Sierra Leone People's Party (SLPP), have claimed that rivals assaulted them while they were running for office.
Since the end of the civil war in 2002, Sierra Leone has held five elections.
According to Marcella Samba Sesay, chairperson of the NGO National Elections Watch, the country's elections have a history of being largely peaceful, free, and credible despite the estimated 50,000 lives lost during the 11-year conflict.