Iran Press/Asia: Attaullah Khogyani, a spokesman for the provincial governor, said the explosion happened when supporters of the disqualified candidate were trying to shut down the election commission office.
According to Reuters,Eight people were also wounded. No group has claimed responsibility for the attack.
A ban on dozens of Afghan strongmen and lawmakers from running for parliament because of suspected links to illegal armed groups has spurred threats and protests to disrupt a general election that is already at risk from worsening security.
The Taliban have warned people not to vote in the October polls and dozens of people have been killed in militant attacks on voter registration centers.
Supporters of disqualified candidates have held sit-in protests outside a number of election commission offices around Afghanistan over the past two weeks.
Security forces launched a drive to evict them on Saturday.
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