Cameroon's 92-year-old president has won a controversial eighth term, in a fiercely disputed election.

Paul Biya, who is the world's oldest head of state, won 53.7% of the vote, compared to the 35.2% of opposition leader Issa Tchiroma Bakary, the Constitutional Council declared.

Before the announcement, Tchiroma Bakary - a former Biya ally - insisted he had won the election, but the ruling Cameroon People's Democratic Movement (CPDM) dismissed his claim.

The election, held on 12 October, has been marred with deadly violence, and in recent days, hundreds of Tchiroma Bakary's supporters have defied protest bans in several cities, and clashed with security forces.

Biya thanked voters for once again trusting him. I sincerely hope that, together, we resolutely undertake to build a peaceful, united and prosperous Cameroon, he said in a statement.

On Sunday, at least four people were killed during protests in Cameroon's economic capital of Douala. The regional governor, Samuel Dieudonné Diboua, said police posts had come under attack and security forces had defended themselves.

The unrest continued on Monday, when a number of people were shot dead near Tchiroma Bakary's residence in the city of Garoua, a local journalist on the scene reported. Meanwhile, Tchiroma Bakary claimed that snipers were firing at civilians gathered outside his home.

Protesters expressed concerns over what they said was a plan by the ruling CPDM to steal the victory from Tchiroma Bakary.

The situation in the capital, Yaoundé, remains tense with most shops and schools closed and many civil servants staying home.

Biya's victory has been described by the governing party as under the sign of greatness and hope, despite his longstanding leadership having faced criticism for economic mismanagement, regional violence, and limitations on freedom of speech.

Local sentiments reflect a mix of skepticism and calls for peace amidst the aftermath of the election results. Analysts warn that the potential for escalating political turmoil looms if the perceptions of electoral fraud continue to fester.