As Sudan held its first multi-party polls since 1986, 16 million people are registered for the presidential, parliamentary, regional and state elections.
A woman bends over to search for her name on a voting list. The process is complex, with some Sudanese people in the south having to cast 12 different votes.
As Sunday's voting got underway, polling centres were in disarray as they found voters using the wrong ballot paper or names or symbols were incorrect.
Election observers have reported irregularities by the president's supporters. But many Sudanese were happy to have the opportunity to vote, despite the complaints.
A man demonstrates his allegiance to President Omar Hassan al-Bashir and his National Congress Party. Mr Bashir, who is wanted by the UN for alleged war crimes, is widely expected to win.
The country's national election commission claims the polls will be free and fair. One official described the process as "foolproof".
Women vote in a refugee camp on the outskirts of the Darfur town of Fasher. Some Sudanese, not familiar with the process, were afraid to dip their finger in ink after casting their votes.
Opposition figures complained that election officials had allowed Sudan's numerous security forces to register to vote at their barracks. They claimed their presence would intimidate voters.
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