Cameroon's President Paul Biya, one of the world's oldest serving rulers, has secured an eighth term in office, vote results showed, as the main opposition challenger who has also claimed victory reported gunfire near his home.

Biya, 92, won 53.66 per cent of the vote, against 35.19 per cent for his former ally, Issa Tchiroma Bakary, the Constitutional Council said.

A new seven-year term could keep the veteran leader in power until he is nearly 100.

Opposition protesters have clashed with security forces repeatedly over the past week after partial results suggested Biya was on course to win the October 12 vote.

There was no immediate comment on the result from the government, which has rejected opposition accusations of irregularities.

After the results were announced, Tchiroma wrote

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