A bomb in a busy Afghan market killed four people on Saturday in the western province of Herat, an official said. The early morning explosion also wounded 12 people, including three policemen who were on patrol in the bazaar in Shindand district, Herat provincial government spokesman Muhiudin Noori said. The blast came three days after a bicycle bomb in Herat's provincial capital wounded 14 people. "Once again the enemy has attacked in Herat ... They have no other target than killing civilians," Noori was quoted as saying by the Associated Press.