Taliban assassins riding motorbikes gunned down a senior election official in northern Afghanistan on Wednesday, raising fears the presidential vote due in April will trigger a surge in violence.
Amanullah Aman, the head of the Independent Election Commission (IEC) in Kunduz province, was killed by two gunmen outside his home in Kunduz city as he left for work.
He was the first election official to be murdered since candidate nominations opened on Monday. All potential runners in the wide-open race to succeed President Hamid Karzai must declare themselves by October 6.
"Aman was shot dead in the morning in front of his house as he was leaving for his office," Kunduz provincial spokesman Enayatullah Khaliq told AFP.
"Two men on motorcycles opened fire on his car and severely wounded him, he later died in the hospital."
Deputy police chief Ebadullah Talwar said that Aman was murdered after going grocery shopping and was not accompanied by any bodyguards. Talwar added that five arrests had already been made, but gave no further details.
The Taliban, who often target government officials, released a brief statement on their website claiming responsibility for the attack.
Last month Taliban leader Mullah Omar called the election a "waste of time", but has so far stopped short of threatening an increase in attacks targeting preparations for the vote on April 5.
"We'll boycott elections in April. We did not say we'll attack it, but the commanders on the ground will," one member of the Taliban, which dismiss Karzai as a US puppet, told AFP recently.
Kunduz, which borders Tajikistan, is in the more peaceful north of Afghanistan, but it is still a hotbed of Islamist insurgent activity.
The province is also a major route for drug trafficking and has a volatile mix of rival ethnic groups and armed militia.
A successful presidential election next year is widely seen as the key test of international military and aid efforts since the fall of the Taliban in 2001.
Karzai on Tuesday repeated his vow to help oversee a safe and credible vote, which will be Afghanistan's first democratic transfer of power.
"A good election this time will be good for my good reputation," he said.
"I will be involved until the candidates are registered... and I will only get involved again on polling day when I will cast my vote for my favourite candidate.
"I will remain neutral in all election deals, but will be providing security and will stop foreigners meddling in it."
Karzai has said former warlord Abdul Rasul Sayyaf, 2009 runner-up Abdullah Abdullah and former finance minister Ashraf Ghani were possible candidates.
Attention has also recently focused on low-profile Foreign Minister Zalmai Rassoul as a strong technocrat candidate from within Karzai's camp.
The election coincides with the withdrawal of 87,000 NATO combat troops by the end of 2014 as Afghan soldiers and police take charge of the fight against the Taliban.