YAOUNDE, Cameroon — Opposition leaders in Cameroon on Tuesday contested the official results of the Oct. 12 presidential election after the country’s top court declared that Paul Biya , the world’s oldest leader, had won re-election as protests continued across the country.

Citizens began protesting in mid-October after opposition leader Issa Tchiroma Bakary claimed victory as the official results were still being tallied. Since then, security forces have clashed with angry protesters in many cities including Douala and Garoua — opposition strongholds — and in the capital, Yaounde. At least four people have been shot and hundreds arrested as opposition supporters demanded credible results.

The Constitutional Council said Monday that Biya, 92, had won the election with 53.66% against

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