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Russia said on Thursday that leaks spewing gas into the Baltic Sea from pipelines to Germany appeared to be the result of state-sponsored “terrorism,” as an EU official said the incident had fundamentally changed the nature of the conflict in Ukraine.

The European Union is investigating the cause of the leaks in the Gazprom-led Nord Stream 1 and 2 pipelines and has said it suspects sabotage was behind the damage off the coasts of Denmark and Sweden.

Four days after the leaks were first spotted, it remains unclear who might be behind any attack on the pipelines that Russia and European partners spent billions of dollars building.

“This looks like an act of terrorism, possibly on a state level,” Kremlin spokesman Dmitry Peskov said, adding: “It is very difficult to imagine that such an act of a terrorism could have happened without the involvement of a state of some kind.”

Russia also said the United States stood to benefit, in a war of words with the West over who was responsible. Moscow has previously said the leaks occurred in territory that is “fully under the control” of U.S. intelligence agencies.

Russia’s Foreign Ministry spokeswoman Maria Zakharova told a news briefing Washington would be able to boost its liquefied natural gas (LNG) sales if the pipelines were put out of use.

But U.S. news channel CNN, citing three sources, reported that European security officials had observed Russian navy support ships and submarines not far from the leaks.

Asked to comment on the CNN report, Mr. Peskov said there had been a much larger NATO presence in the area.

Ms. Zakharova called for an EU investigation to be “objective,” and said Washington would have to “explain itself” – a reference to President Joe Biden’s comment in February that, if Russia invaded Ukraine, “there will no longer be a Nord Stream 2″.

The White House has dismissed Russian allegations that it was responsible for the damage to Nord Stream and Mr. Biden’s comments were referring to efforts at the time to secure certification to bring Nord Stream 2 into commercial use.

Leaks from the Nord Stream 1 pipeline are likely to be stopped on Monday, the pipeline’s operator told Reuters.

But the spokesperson for Nord Stream AG said it was not possible to give any forecasts for the pipeline’s future operation until the damage had been assessed.

Russia had halted deliveries via Nord Stream 1, saying Western sanctions had hampered operations.

While neither pipeline was supplying gas to Europe when the leaks were first detected, both had gas in them.

TotalEnergies said on Thursday it had observed “unauthorized drone activity” near one of its offshore oil and gas installations in the North Sea.

Denmark, has like other countries in the region, raised its safety level for its power and gas sector after several countries said two Russian pipelines to Europe spewing gas into the Baltic Sea had been attacked.

“There have been observations of unauthorized drone activity at the Halfdan B oil and gas field in the North Sea,” a spokesperson said in a written comment, adding the activity had been observed on Wednesday.

“We have taken the necessary steps in accordance with our security procedures and are in close dialogue with the authorities.”