Nato believes Baltic Sea gas pipeline leaks were sabotage

A small release from Nord Stream 2 , pictured on Wednesday (Swedish Coast Guard via AP)

Nato has warned it would retaliate over any attacks on the critical infrastructure of its 30 member countries and joined other Western officials in citing sabotage as the likely cause of damage to two natural gas pipelines in the Baltic Sea.

The warning came as the Swedish coast guard confirmed a fourth leak on the pipelines off southern Sweden, which is in the process of joining Nato.