At least four officials of the Independent Election Commission (IEC) and two policemen were wounded in the attack, said Najib Danish, a spokesman for the interior ministry in Kabul.
Voting in Kandahar was postponed after an October 18 attack by a turncoat Afghan guard who opened fire at a high-profile security meeting in the provincial capital that was also attended by American troops.
Hajji Hamdullah Gulalai, head of one of the largest tribes in south Kandahar, complained bitterly about the chaos at polling stations, where workers were late arriving and had difficulty finding the names of people waiting to cast their ballots. The U.S. -backed government is rife with corruption and many Afghans have said they do not expect the elections to be fair.
"There were problems with the voter's registration lists, some (sections of the) alphabet were missing and people were disappointed and left the process without casting their votes", Rohullah a resident of Kandahar said.
The Monday morning suicide attack near election commission in Kabul, Afghanistan has claimed the life of one and injured 6 others, Kabul police spokesman said.
With vote counting under way, the IEC is scheduled to release preliminary results on November 10. Thirty-two of Afghanistan's 34 provinces voted over two days on Oct 20-21.
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Six bodies and 31 wounded had been taken to hospitals in the city, health director Salim Asgharkhil said.
According to the Independent Election Commission, at least 8.8 million people have been issued voter cards to cast votes for 2,500 candidates seeking seats in the Wolesi Jirga (lower house of parliament).
No individual or group has so far claimed responsibility behind the incident.
The ballot was also marred by lengthy delays at polling stations and allegations of fraud.
But some polling centers had still not opened by 8am, while dozens of people lined up outside.