The development came as insurgent attacks against security forces have stepped up across Afghanistan, including in Farah province.
In today's assault, the Taliban launched a multi-pronged attack and stormed the district headquarters in Anardara, which they were able to hold on to for a few hours before Afghan reinforcements arrived.
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.
The Afghan forces also carried out heavy airstrikes during the day in Anardara and more than 50 Taliban fighters were report killed so far, he added.
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Fared Bakhtawer, the head of provincial council in Farah, confirmed the developments and said the Taliban have been surrounded in other parts of the district.
"The Afghan forces have warned the Taliban either to surrender or die on the battle field," said Bakhtawer.
The Anardara attack followed a weekend assault in Bala Buluk district that killed 15 Afghan forces seven army commandos and eight policemen.
In a separate report, seven civilians including three children and two women were killed last night in eastern Nangarhar province when their vehicle was hit by a grenade, said Attahullah Khogyani, spokesman for the provincial governor.
Khogyani said two other people in the vehicle were wounded in the attack in Bati Kot district. The victims are all members of a single family, he added.