Weeks after Nigeria’s presidential election results sparked deadly riots across the north, the nation’s largest opposition party is headed to court alleging voting fraud in President Goodluck Jonathan’s win and asking for a revote in 24 states.

Though international observers say this was the best-run election Nigeria has seen in over a decade, the opposition party, Congress for Progressive Change, thinks their candidate Muhammadu Buhari got cheated. The group filed a petition at the nation’s electoral tribunal Saturday.

"We have detailed election malpractices in the south-south, south-east, some states in the south-west geopolitical zones and even some states in the north," CPC chairman Tony Momoh said in statement, the BBC reports. "We want the tribunal to nullify elections in these areas where there were flaws and conduct fresh elections in those areas.”

Buhari, who lost to Jonathan by more than 10 million votes, had said before the election that he would not go to court if he lost, writes the Associated Press. The former military ruler also had contested Nigeria's 2003 and 2007 elections, unsuccessfully challenging the results each time. Buhari did say, however, that his party was free to oppose the results.

Jonathan won the election with 59 percent of the vote, while Buhari got 32 percent of the vote.

(Photo: ASSOCIATED PRESSAP)