YAOUNDE, Cameroon — The governing party in Cameroon said Thursday that one of its offices was set on fire as tensions rise over fraud allegations in the Oct. 12 presidential election.

Opposition candidate Issa Tchiroma Bakary claimed victory this week and urged President Paul Biya, the world’s oldest president at 92, to concede. Biya’s party has rejected Tchiroma’s claim of victory and accused the opposition candidate of trying to disrupt the electoral process. The constitutional court is expected to announce the final official results by Oct. 26.

Tchiroma alleged Wednesday that there were signs of vote tampering, echoing civil society groups’ earlier reports of “several irregularities,” including attempted ballot stuffing.

The office of the Cameroon People’s Democratic Movement in the

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