At least four Pakistani soldiers have been killed in an attack in Balochistan province.
Unidentified attackers fired a rocket on a Frontier Corps convoy in the Sui area, some 400km (250 miles) from the provincial capital, Quetta.
The Frontier Corps guard Pakistan's biggest natural gas fields in Sui.
Officials said three other soldiers had been wounded in the ambush, which follows a number of attacks blamed on tribesmen in recent weeks.
The soldiers were patrolling the area when "unknown terrorists fired a rocket from a nearby mountain", the Associated Press quotes local police official Munir Gondal as saying.
The situation in Balochistan, one of Pakistan's poorest provinces, has been volatile in recent weeks.
Several attacks have taken place on paramilitary troops and state-owned oil and gas installations.
The attacks have been blamed on tribesmen fighting for a share of the royalties from the gas extracted from the region.
Last week, troops found a huge quantity of explosives and destroyed a number of camps run by "criminals" in Baluchistan.
Chief minister Jam Muhammad Yousaf said explosives, batteries and remote control devices were found in the raids on 25 camps in the Turbat district.
Earlier, unknown attackers raided a military convoy near the port city of Gwadar, south of Turbat.