World Bulletin / News Desk 

An independent presidential candidate on Wednesday pulled out of Sudan's presidential election, citing what his campaign managers described as "vote rigging."

Zanoun Abu Bakr, campaign spokesman for presidential candidate Omar Awad al-Karim, said members of the campaign had documented electoral violations at a number of polling stations in capital Khartoum.

"Election results will never be honest," Abu Bakr told. "That's why our candidate decided to withdraw."

Abu Bakr said his campaign planned to notify local and international election observers regarding the alleged violations.

On Wednesday, Sudan's official electoral commission extended the elections by one day.

The polls, which kicked off Monday, were originally scheduled to wrap up on Wednesday.

Up to 13 million Sudanese voters are eligible to vote in the polls – the country's first elections since the secession of South Sudan in 2011.

Along with al-Karim, 14 other candidates – including incumbent President Omar al-Bashir – are running in Sudan's presidential election.

It is widely believed that al-Bashir, who has ruled the country for over 25 years, will sweep the presidential race.

Voters will also elect 425 members of parliament and 2,235 members of state legislative assemblies.