Iqbal Bahir, the spokesman for Farah's police chief, says two other policemen were wounded in the late last night attack in Pusht-e Rod district.
Zabihullah Mujahid, the Taliban spokesman, claimed responsibility for the attack.
Separately, in the eastern Nangarhar province at least one civilian was killed and 14 others wounded Monday during a battle between the Afghan security forces and insurgents, said Attahullah Khogyani, a spokesman for the provincial governor.
The forces used both ground and air forces against the Islamic States fighters, killing dozens in the Haska Mena district, added Khogyani.
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