Peru's Camisea gas pipeline has developed a leak for the fifth time in 18 months, causing a fire that injured two people.
Officials said on Sunday that the rupture occurred in Peru's southern jungle region Saturday.
Peruvian Prime Minister Pedro Pablo Kuczynski said he did not rule out sabotage.
The pipeline, built with Inter-American Development Bank funding, brings natural gas from Peru's southern Amazon region to the capital, Lima. It has leaked five times since it started operating in 2004.
Environmentalists say the project harms ecosystems and affects the health of indigenous people.
A U.S.-based environmental consultancy said last week that previous leaks were caused by poor construction, insufficient inspections and pipe corrosion.
Some information for this report was provided by AP and Reuters.