Unidentified gunmen shot dead two paramilitary soldiers on Friday night in Khuzdar town, 240 km (150 miles) south of here, police said on Saturday. The soldiers came under attack while they were walking to a marketplace late on Friday.
"The two terrorists fled on a motorbike after shooting the soldiers," a spokesman for Frontier Corps told reporters.
A spokesman for an underground Baloch nationalist group, Balochistan Liberation Army, claimed responsibility for the attack in a telephone call to Quetta Press Club.
"We will continue to target the security forces, unless they stop killing innocent Balochis," the group's spokesman, Meerak Baloch, said.
Meanwhile, officials said that suspected saboteurs early on Saturday damaged a railway track cutting off traffic between Harnai and Sibbi, some 100 kilometers south-east of here.
"The explosive material planted under a bridge destroyed 150 feet (45 metres) stretch of the railway line," railway spokesman Ghulam Mustafa said.
He said that repair of the rail track, which is used to transport coal and vegetables from Harnai to Sibbi, would take at least four days.