Iran's Gas Management Centre said the explosion was caused by "terrorist attacks”, state-linked Irna reported.
The semi-official Mehr news agency said authorities were still investigating the cause of the blast at the "high-pressure” pipeline, although no casualties were reported.
Ismail Yazdani, the head of emergency services in Borujen, said the explosion had ruptured the country's main gas transmission line.
Iran produces about a billion cubic meters of gas a day and has some of the largest proven reserves in the world, at about 30 trillion cubic meters, as well as a large network of pipelines that also export gas to Iraq and Türkiye.
A branch of the Iran Gas Trunk Line, also known as Igat, runs near the site of the blast, but there was no word on whether it had been damaged.
09:17
An explosion has occurred at a gas pipeline in Iran's Chaharmahal and Bakhtiari province, reported from Mehr News Agency.
The incident happened in Boroujen city and a subsequent fire occurred following the blast, according to the Boroujen governor.
The firefighters and rescue teams were immediately dispatched to the scene of the incident.
Some sources reported that the incident left no casualties.
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