US liquefied natural gas exporter Freeport LNG has released the findings of a report detailing the causes of an explosion and fire in June that have kept the terminal offline for more than five months.

The report, carried out by Texas-based incident investigation company IFO Group, said a segment of piping carrying LNG did not have over-pressure protection, which allowed the LNG to warm and expand. The LNG became a boiling liquid, triggering a vapour explosion and causing a pipe to rupture.