The final result in the run-off presidential election is not due for several weeks, and international concerns have focused on the risk of a disputed outcome as the two candidates started to trade fraud allegations.
Officials said more than 50 people were killed in separate Taliban strikes yesterday, when more than 7 million voters cast their ballot in the contest between former foreign minister Abdullah Abdullah and ex-World Bank economist Ashraf Ghani.
Eleven voters in the western province of Herat had their fingers -- which were dipped in ink to register their ballot -- cut off by insurgents.
The UN described the mutilations as "abhorrent".
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More than 70 militants were also killed in fighting during the day, according to the interior ministry.
The White House praised voters' courage and called the elections "a significant step forward on Afghanistan's democratic path", after the turnout topped 50 per cent.
"It is win or lose now," said Kate Clark, director of the Afghanistan Analysts Network.
"The voting is only one phase of the election, and there is still a lot that could change. Being a good loser doesn't gain you much here.
"If it is close and fraud looks to have been a lot, and either candidate wants to really make a fuss, then we could be in for months of wrangling."
A credible election and a smooth handover of power would be a major achievement for Afghanistan's backers after 13 years of costly military and civilian assistance.