At least four soldiers from Pakistan's Frontier Corps were killed and three injured on Friday when their vehicle was hit by a roadside bomb in Balochistan province, an official said.
The incident occurred in the remote Jhao area of Awaran district, dpa reported.
Three soldiers died on the spot while fourth succumbed to injuries in the hospital, where another three were being treated for their wounds, Frontier Corps spokesman Khan Wasseh told dpa from the provincial capital Quetta.
It was not known how many troops were aboard the vehicle.
Nobody took responsibility for the attack but the district is a stronghold of separatist Balochistan Liberation Front militants, fighting for a Baloch state.
Several nationalist groups in the mineral-rich region are waging an armed struggle. They blame the central government for depriving the province of its natural wealth.
The impoverished Awaran district was hit by a magnitude-7.7 quake in September that killed more than 500 people.
Militants targeted soldiers sent to carry out relief operations.