Kabul: Afghans defied Taliban threats by voting Saturday in a second-round presidential election, as US-led combat troops wind down a 13-year war that has failed to defeat the insurgents.
The Taliban claimed responsibility for two rockets that exploded near Kabul airport as polls opened, but Afghan and NATO officials said there were no casualties.
The run-off election will decide whether former foreign minister Abdullah Abdullah or ex-World Bank economist Ashraf Ghani leads the country into a new era of declining international military and civilian assistance.
President Hamid Karzai is due to step down after ruling the country since 2001, when a US-led offensive ousted the austere Taliban regime for sheltering Al-Qaeda militants behind the 9/11 attacks.
"We are very proud to be choosing our favourite candidate," Karzai said after voting. "Today Afghanistan goes from a transition period toward long-lasting peace and stability."
Afghan officials and international allies are hoping for a repeat of the first-round vote in April, when the insurgents failed to launch a single high-profile attack and voter turnout was more than 50 percent.
But the stakes are high with the Taliban issuing specific threats to target polling stations and widespread fears that electoral fraud could produce a contested result.
UN head of mission Jan Kubis issued a stark warning to candidates' supporters not to resort to the ballot-box stuffing that marred the 2009 election when Karzai retained power.
"Do not commit fraud. Do not use intimidation or manipulation to favour your candidate," he said ahead of polling day.
Abdullah secured 45 percent of the first-round vote with Ghani on 31.6 percent, after investigations into multiple fraud claims from both sides.
The two candidates came top of an eight-man field, triggering the run-off election as neither reached the 50 percent threshold needed for outright victory.
"I want someone who can improve our economy, create jobs and improve our lives," said Janat Gul, 45, a shopkeeper voting in Kabul.
"If the economy is good there will be no insurgency, everyone will be busy working, not fighting."
A smooth handover in Afghanistan's first democratic transfer of power would be a major achievement for the international effort to establish a functioning state after the depredations of the Taliban era.
The country has seen massive changes as billions of dollars of aid money poured in, bringing rapid development in some cities but only limited improvements in security, women's rights and education.
Long wait for results
Harsh terrain and poor roads make holding an Afghan election a logistical challenge, with thousands of donkeys used to transport ballot boxes to remote villages.
Counting the ballot will take weeks. The preliminary result is due on July 2 and a final result on July 22.
Ahead of the vote, the Taliban said that polling booths would be targeted by "non-stop" assaults.
"By holding elections, the Americans want to impose their stooges on the people," the insurgents said on their website.
On Saturday, they said their fighters had attacked polling stations around the country, but Afghan officials did not confirm the claims.
Recent weeks have been relatively peaceful except for a suicide blast targeting Abdullah in Kabul last week that left 12 dead.
Ahead of the vote, police and soldiers searched almost every car on the roads of the capital, and Afghan officials expressed confidence in the security forces, who have been trained by the US-led military coalition.
"The level of threats is higher compared to the first round, but we have gained far more experience," said interior minister Omar Daudzai.
Ethnic friction is also a concern as Abdullah's support is based among the Tajik minority and other northern tribes, while Ghani is a Pashtun -- Afghanistan's largest ethnic group, which is strongest in the Taliban heartlands of the south and east.
Karzai, who is constitutionally barred from a third term in office, has fulfilled his pledge not to interfere in the election -- in public at least -- though he is tipped to retain an influence after handing over power.
His relationship with the US soured badly, and the next president is likely to reset ties by signing a long-delayed pact for some US troops to remain on a training and counter-terrorism mission after this year.
Last month President Barack Obama said that if the pact is signed, 9,800 of the 32,000-strong US deployment would stay in 2015 with just a few thousand remaining into 2016.
The US-led NATO military mission said it would be in a "support role" on Saturday, ready to assist if requested by Afghan authorities.
The coalition has suffered about 3,450 fatalities since operations began in later 2001.
Priorities for the incoming president will be to stabilise the faltering economy as aid funding falls, and a fresh attempt to bring peace after decades of war by exploring peace talks with the Taliban.
