DHAKA: Afghans are voting in run-off polls that will determine who will succeed President Hamid Karzai.
The choice is between former Foreign Minister Abdullah Abdullah and ex-World Bank economist Ashraf Ghani.
It should be the first time that power in Afghanistan has been democratically transferred.
But the Taliban has threatened to target polling stations and there are concerns that voting fraud could produce a disputed result.
'Non-stop' assaults
As most foreign soldiers prepare to withdraw by the end of this year, whoever becomes the new leader will take over a country where Taliban insurgents remain active, where the economy is weak, where corruption is endemic and where the rule of law is for the most part unenforced.
The Taliban have pledged to do their utmost to disrupt the vote with "non-stop" assaults.
"By holding elections, the Americans want to impose their stooges on the people," the insurgents said on their website.
About 12 million Afghans are eligible to vote. Polls opened at 0700 local time (0330 BST) amid tight security at more than 6,000 polling centres.
Abdullah won 45% of the first-round vote, with Mr Ghani securing 31.6% - multiple fraud claims were made against both sides. The pair came top of an eight-man field, but because neither reached the 50% threshold needed for an outright victory, Saturday's run-off election was necessary.
Source: BBC
BDST: 0955 HRS, JUN 06, 2014