However, it remained far from clear who might be behind any foul play, if proven, on the Nord Stream pipelines that Russia and European partners spent billions of dollars building.
Poland's prime minister blamed sabotage for the leaks, without citing evidence, while the Danish premier said it could not be ruled out.
Operator Nord Stream said the damage was "unprecedented".
CUTTING SUPPLIESRussia reduced gas supplies to Europe via Nord Stream 1 before suspending flows altogether in August, blaming Western sanctions for causing technical difficulties.
The new Nord Stream 2 pipeline had yet to enter commercial operations.