A main gas pipeline in Pakistan's south-western Balochistan province has been blown up, officials say.
The police said explosives were placed under the pipeline in Mastung city, some 40km (24 miles) south of the regional capital, Quetta.
The pipeline was providing supplies to provincial capital Quetta and neighbouring cities.
Gas-rich Balochistan has seen months of violence as tribal groups push for greater political and economic rights.
Suspected tribal militants also damaged an electricity line after a separate explosion , the police said.
Gas pipelines were blown up in Sui earlier this week which led to the suspension of supplies in Kohlu and Dera Bugti districts.
The rebels have blown up gas pipelines, railway lines and electricity lines in the past. They have also attacked army bases and government buildings.
Pakistan's President Pervez Musharraf has accused tribal leaders of putting up armed resistance to his plans to build a sea port and road network to turn Balochistan into a major trading zone.
But the Baloch tribal leaders say their struggle is for greater provincial autonomy and an increased share of mineral resources from the gas and oil rich province.