The district police chief for Enjil district of Herat province was injured following an explosion on Sunday.
The incident took place in Qafsalan area following an Improvised Explosive Device (IED) attack, local officials said.
At least three policemen were also injured following the blast.
No group includig the Taliban militants has so far claimed responsibility behind the incident.
Enjil is among the relatively volatile districts in western Herat province where insurgents belonging to Taliban group are active and often carry out insurgency activities.
Taliban militants frequently use Improvised Explosive Device (IED) as the weapon of their choice to target Afghan and coalition security forces.
