A roadside bomb killed 12 Afghan traders as they drove through Afghanistan's remote west on Monday in an attack apparently meant for Afghan or foreign troops, witnesses and officials said. "I saw 12 men were killed and four were wounded," Abdul Razzaq Samadi, a local tribal chief who was at the scene of the blast, told Reuters. "I took four wounded men to the hospital. Their condition was not good," he said. The blast happened on a dirt road that links two districts in Farah province.