Updated

A Pakistan Railways official says a bomb blast has targeted a train, killing three passengers.

Mohammad Ejaz says Friday's blast took place as the train was en route from the northwestern city of Peshawar to the southern port city of Karachi. The explosion blew up the train tracks in the central district of Rajanpur.

Ejaz says the bombing also wounded 15 people.

No one immediately claimed responsibility for the attack.

Pakistani Islamic militant groups frequently target soldiers, police, government officials and civilians.

The area where the train bombing occurred borders Baluchistan province, which has long been the center of a low-level insurgency by nationalist groups that demand more autonomy and a greater share in the region's natural resources.