The incident occurred at Toba Achakzai area of Chaman, a town near the border with Afghanistan, security officials told state-run media.
Three women and two children were among the dead. The injured were taken to the Civil Hospital in Chaman.
No group claimed responsibility for the incident.
President Asif Ali Zardari and Prime Minister Raja Pervez Ashraf condemned the incident.
Ashraf directed provincial authorities to take steps to prevent such incidents in future.
