A man uses his friend's back to fill out his voting card at a voting station during the elections in Croix des Bouquets just outside of Port-au-Prince in Haiti on Sunday (Logan Abassi/Reuters/UN MINUSTAH/Handout)

A dozen presidential candidates called for the annulment of the general election in Haiti, citing widespread fraud.

Opposition frontrunner Anne Marie Josette Bijou read a statement on behalf of 12 of the 18 presidential candidates on Sunday afternoon before the polls closed, saying the vote should be scrapped because of  "this massive fraud."

The UN mission in Haiti and representatives of the United States, Canada and the European Union expressed concern about the incidents that marred the election. But the Haitian government said the vote would continue.

Critics have questioned the wisdom of holding an election while the impoverished Caribbean country copes with 1.3 million displaced people left homeless after the January quake, a developing cholera outbreak that has killed at least 1,500 and sickened many others and recent unrest prompted by suspicions that Nepalese UN peacekeepers brought the disease to Haiti.

Preliminary election results won't be available until Dec. 7 with the final tally made Dec. 20. It's unlikely any candidate will secure the necessary 50 per cent of the vote to avoid a run-off election between the top two contenders, which would take place Jan. 16.

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