At least 35 people were killed in a roadside mine blast in Herat-Kandahar Highway early on Wednesday morning, local officials confirmed.
The incident has taken place at Shawis area of Farah province at around 7 am on Wednesday.
A bus carrying dozens of passengers was traveling from Farah to the western Herat province, a health official, Mohammad Ibrahimi said.
At least 27 people including women and children were also wounded in the incident, a spokesman for Farah police Mohibullah Mohib said.
Meanwhile, a security official told Ariana News that the Taliban militants had planted the mine at the area.
No group or individual including Taliban militant group has claimed responsibility for the explosion.