Yesterday's explosion is 28th for the pipeline, which recently stopped working, local media reported.
"The pipeline used to export gas to Israel, but has stopped working during the last period. However, it still has some gas," officials from the gas company said.
The source added that some unknown militants had planted explosives under the pipeline and detonated it from a distance.
Security personnel have cordoned off the area in search for the attackers, the source said.