Afghan officials have accused the Taliban of planting a roadside bomb in the western province of Farah. Civilians often take the brunt of fighting between insurgents and pro-government forces.
A "Taliban roadside bomb" on Wednesday killed at least 34 people, mostly women and children, Afghan authorities said.
"The bomb was freshly planted by the Taliban insurgents to target Afghan and foreign security forces," said provincial police spokesman Mohibullah Mohib.
Insurgents, such as the Taliban militant group, regularly target pro-government forces but civilians often take the brunt of attacks.