He said three other security forces are missing and more than 30 insurgents were killed in the battle.
The Taliban immediately claimed responsibility saying the district is now under their control.
Farah province, which borders Iran, is a centre of opium poppy cultivation in western Afghanistan.
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On March 10, officials said dozens of people were killed after Taliban militants ambushed Afghan security forces in the Bala Buluk district, sparking an hours-long gunbattle.
A senior official in the province said that reinforcements have reached the area in a bid to push back the fighters.
The exact number of killed or wounded is still not clear as the fighting is still under way, officials said.
Nasrat Rahimi, deputy spokesman for the Interior Ministry, says that along with the eight killed in the assault, 10 security forces were wounded in the morning attack.
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The victims are all members of a single family, Khogyani added.
And how USA forces have "crushed the enemy in the field" (or at least "put the Taliban on the defensive") in "this fight for freedom in Afghanistan", where Bagram Airfield is "a beacon of freedom". "There are casualties to the police, but we lost contact with them and we have no idea about their condition, including the police chief of the district".
The attack triggered a deadly skirmish between fighters from the militant movement and security forces.
The U.S. military's latest estimates from December show the Afghan government controls or has influence over 56 percent of districts, with insurgents controlling or contesting the rest.
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