Wales & West Utilities said people affected should not switch their gas supplies off, despite earlier advice from a local authority.
It said: “We are aware that some information has been issued by a third party advising customers to switch their own gas off. This advice should not be followed at this time.”
A company spokesperson said, external: “A third-party has damaged our gas main near Kingsbridge in Devon and we are aware that this is affecting gas supplies to customers in the area, as well as in Marlborough and Salcombe.
“Since being made aware of the damage caused to our pipe, our engineers have been on site planning the necessary repair and are now beginning the process of undertaking the work.
“This is a very challenging repair and it is too early at this stage to say how long it will take to fully restore supplies, however customers should be prepared for an interrupted gas supply for a few days.”
The company said it will update customers as the repair work continues.
“We have also been working hard making arrangements for customers in the area registered on the Priority Services Register to be provided with alternative cooking and heating facilities. We are working to reach these customers as quickly as we can and would ask for patience as we work our way around them.
“In the meantime, we would ask anyone who is aware of a family member or neighbour who may be vulnerable to check in on them until we reach them.
“We are also liaising with the local council to understand what additional support they can provide.
“We would like to thank people for bearing with us as we work to repair the damaged pipe and deal with the disruption it has caused.”
A further update would follow on Sunday morning, the company added.