The incident occurred on Saturday when a bomb, apparently planted inside a police station in the Deh Rawood area of Uruzgan province, was detonated, local governor Khalifa Sadat told a Press TV correspondent.
Four policeman and two civilians died in the attack.
Taliban spokesman Qari Yousef Ahmadi announced that the militant group claimed responsibility for the attack.
The Taliban have stepped up their attacks across Afghanistan over the past few months, despite the presence of a 130,000-strong US-led foreign military force in the country.
On Saturday, the United Nations warned about the deteriorating security situation in Afghanistan, saying roadside bomb attacks have risen almost twofold in the first quarter of this year compared to the same period in 2009.
A report by the UN said local terrorist cells are getting stronger and conducting complex attacks — mostly in southern Afghanistan, where US-led forces have stepped up their military operations.
The US plans to deploy 30,000 more troops to Afghanistan by August, although the rising death toll has turned public opinion against the prolonged war in the member states of the Western military alliance.
Source: Press TV