Two senior German lawmakers have pointed the finger at Russia over suspected sabotage of Nord Stream.
European lawmakers had previously left open the question about who the suspected Nord Stream saboteur could be.
On Monday, Danish and Swedish authorities detected three severe leaks affecting the four Nord Stream pipelines, which run from Russia to Germany through the Baltic Sea.
Before Russia invaded Ukraine, Nord Stream was intended as the main artery for natural-gas exports from Russia to Europe.
The US Central Intelligence Agency warned Germany weeks ago about potential attacks on Nord Stream, German magazine Der Spiegel reported Tuesday.