Pipeline Explosion in Balochistan
Reports of the Baloch insurgency's demise appear to have been greatly exaggerrated.
A spokesman for the Sui Southern Gas company said the pipeline was located some 350km (218 miles) south of the regional capital, Quetta.
Pipelines are targeted regularly in this gas-rich province where tribal groups are pushing for greater autonomy.
The attack will affect supplies to Karachi and areas of Balochistan.
The director of the gas company, Naeem Akhwand, told the BBC that major infrastructure consumers, like the Water and Power Development Authority, Karachi Electricity Supply Company and Pakistan Steel Mills would be affected by the attack.