Chad's prime minister and opposition leader Succes Masra has tendered his resignation after interim President Mahamat Idriss Deby was confirmed as a winner of the May 6 presidential election, Masra said on Wednesday.

Masra, a staunch opponent of the junta, which seized power in April 2021, was appointed prime minister of the transitional government in January, four months ahead of the poll, in a move to appease the opposition.

In March, his candidacy was cleared for the presidential election to return the country to constitutional rule.

The oil-producing country is the first of a string of coup-hit states in West and Central Africa's Sahel region to attempt such a return.

Before the official announcement of preliminary results, Masra claimed victory, alleging that electoral fraud was being planned.