A Pakistani official says gunmen forced 20 Shiites off buses in northern Pakistan and killed them.
The police official says the incident happened Thursday in the Naran Valley.
A police official says the victims were traveling from Rawalpindi, near the capital Islamabad, a mostly Shiite area.
There have been several such sectarian attacks in the region in the past. Many Sunni extremists do not view Shiites as true Muslims.