Voting in the Democratic Republic of Congo second-ever presidential election in four decades was marred by unrest on Monday.
The UN said some polling stations were set ablaze by those angry about a delayed start to the vote.
Incumbent head of state Joseph Kabila, in power since 2001, is predicted to win.
His main rival is veteran opposition leader Etienne Tshisekedi.
Thirty million registered voters will also select 500 MPs in a parliamentary poll.
Kabila inherited power after his father, Laurent Desiré, was fatally shot by one of his bodyguards ten years ago.
In 2006, he won the country’s first presidential election after years of civil war.
The west African country, a former Belgian colony, is one of the world’s poorest, despite an abundance of mineral wealth.