Danish maritime authorities have set up an exclusion zone because of danger to shipping from a suspected act of sabotage on natural gas pipelines running under the Baltic Sea.

The country’s energy agency said ships have been told to stay five nautical miles (9.2 km) from the scene of the leaking Nord Stream 2 pipeline, south-east of the Danish island of Bornholm.

The gas leak was “dangerous for naval traffic”, the Danish Energy Agency said in a statement.