With our correspondent in Accra, Marine Jeannin

After the battle of words, the battle of numbers. The day after the announcement of his rival's victory, incumbent president Nana Akufo-Addo, the opposition candidate John Mahama described the official results released by the Electoral Commission as "fraudulent". He promised to take "all legitimate measures to reverse this injustice".

This Sunday, his party, the NDC, held a press conference intended to expose the Electoral Commission's errors. According to its calculations, Nana Akufo-Addo would indeed come out ahead in the presidential election, but with only 49.62% of the vote. This would require a runoff between the incumbent president and John Mahama.

The challenge also concerns legislative elections. According to the provisional results published by the Electoral Commission, the presidential party won 137 seats in Parliament, while the NDC obtained 136. But according to the opposition party's calculations, the NDC actually won 140 seats, giving it a majority in Parliament.

For its part, the Electoral Commission admitted it made errors in its calculations but claims this changes nothing in the results of the presidential election or the legislative elections. Local and international observers have validated the Electoral Commission's conclusions, but regretted that the process was "less transparent" than usual.