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

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, according to BBC.