Russia's Gazprom was, according to the pipeline operator, withdrawing gas from the pipe and redirecting it to the St. Petersburg area's gas network, the energy agency said.

"Controlled pressure reduction is therefore now seen," it said.

Gazprom on Monday said gas had stopped leaking from three ruptured Nord Stream gas lines under the Baltic Sea, and that it might be possible to resume pumping through the remaining single line if a decision were made to start deliveries.

Gazprom and Nord Stream 2 did not immediately respond to requests for comment.

(Reporting by Anna Ringstrom, editing by Stine Jacobsen and Terje Solsvik)