A wounded Afghan man sits in a car at the scene of an explosion in Herat, west of Kabul, Afghanistan, Aug. 15, 2012.
An official says a bomb in a market in western Afghanistan has killed four people.
A spokesman for the Herat provincial government says the explosion on Saturday morning also wounded 12 people, including three policemen who were on patrol.
Muhiudin Noori says the bomb was planted next to a shop in the busy bazaar in Shindand district.
The blast was the latest attack targeting civilians in Afghanistan.
Earlier this week, 35 civilians died in multiple suicide bombings and a market bomb in two different cities in what was the deadliest day for civilians so far this year.