Nasrat Rahimi, Spokesman of the Interior Ministry said the incident took place in Imam Saheb district of Kunduz province.
The victims, who were on their way to attend a wedding ceremony, include eight children, six women and a man, Rahimi said. He added that two others were injured in the explosion.
Government officials blame Taliban for the incident.
The Taliban insurgent group has not made a comment about the report yet.
Kunduz is among the volatile provinces in north of Afghanistan where the Taliban group has a huge presence.