All members of the Shia community, 11 men and three women were taken down from a bus and executed around midnight on Thursday.
Eye witnesses have said that the attackers were wearing military uniforms and stopped two passenger buses near Badgah area of Firoz Koh on the Ghor-Kabul highway.
After looking through the identity documents of the passengers, an official said, Shia Muslims were all killed and the rest were allowed to continue their journey.