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Sabotaged Pipelines and a Mystery: Who Did It? (Was It Russia?)

An attack on gas lines under the Baltic Sea exposes the vulnerability of an already jittery Europe. Some officials suggested Moscow was to blame, but with little evidence, others urge caution.

A photo from the Danish military showing gas welling up off the coast of Bornholm island on Tuesday.Credit...Armed Forces of Denmark, via Associated Press

BERLIN — Two days after a pair of explosions under the Baltic Sea apparently ruptured giant natural gas pipelines from Russia to Germany, the consensus hardened on Wednesday that it had been an act of sabotage, as the European Union and several European governments labeled it an attack and demanded an investigation.

Experts said it could take months to assess and repair the damage to the Nord Stream 1 and 2 pipelines, which have been used as leverage in the West’s confrontation with Moscow over Russia’s invasion of Ukraine. News of a possible attack on the lines heightened already intense fears of painful energy shortages in Europe over the winter.

But the central mystery remains: Who did it?

“All available information indicates those leaks are the result of a deliberate act,” the European Union’s foreign policy chief, Josep Borrell Fontelles, said in a statement on Wednesday. “We will support any investigation aimed at getting full clarity on what happened and why.”

Jake Sullivan, President Biden’s national security adviser, called the episode “apparent sabotage.”

But with little evidence to go on — American officials said that explosive gas pouring from the broken pipes made it too dangerous to get close to the breach — the United States and most of its European allies stopped short of publicly naming any suspects. Still, some officials speculated about the many ways that Russia might gain, even though the pipeline carries its gas.

Poland and Ukraine openly blamed Russia, which pointed a finger at the United States, and both Moscow and Washington issued indignant denials. U.S. officials and outside experts also speculated over whether Ukraine or one of the Baltic states, which have long opposed the pipelines, might have had an interest in seeing them disabled — and in sending a message.

As the war began, Germany blocked the just-completed Nord Stream 2 from going into service, and Russia later shut off the flow through Nord Stream 1, setting off a frantic effort in Europe to secure enough fuel to heat homes, generate electricity and power businesses.

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The German end of the Nord Stream 2 pipeline in Lubmin sits idle, caught up in the dispute with Russia over the war in Ukraine.Credit...Hannibal Hanschke/EPA, via Shutterstock

Some European and American officials cautioned on Wednesday that it would be premature to conclude that Russia was behind the apparent attacks on the Nord Streams, each of which is actually two pipelines. President Vladimir V. Putin likes to show he has his finger on the gas valve, they noted, but wielding that power could mean keeping the pipelines, whose main owner is Russia’s state-controlled energy company, Gazprom, in good working order.

But others noted that one of two Nord Stream 2 pipelines was undamaged, leaving Mr. Putin the possibility of using it as leverage if the winter turns particularly cold.

Many Western officials and analysts said sabotage would fit neatly into Mr. Putin’s broader Russian strategy of waging war on multiple fronts, using economic and political tools, as well as arms, to undermine Ukraine’s allies and weaken their resolve and unity. It demonstrates to an already jittery Europe how vulnerable its vital infrastructure is, including other pipelines and undersea power and telecommunications cables.

“This is classic hybrid warfare,” said Marie-Agnes Strack-Zimmermann, head of the defense committee in Germany’s Parliament, who stressed that for now she had no evidence Russia was behind the attack but believed it was the most “plausible” culprit.

“Putin is going to use every hybrid measure at his disposal to fluster Europeans, from food to refugees to energy,” she said.

Dmitri S. Peskov, the Kremlin spokesman, said that accusing Russia was “predictably stupid and absurd.” He said American natural gas suppliers were reaping “huge profits” from increased sales to Europe, suggesting that the United States was to blame.

“Of course we were not,’’ said Adrienne Watson, the spokeswoman for the White House’s National Security Council, in a rare on-the-record denial. “We all know Russia has a long history of spreading disinformation and is doing it again here.”

Russian news outlets picked up on the Kremlin’s allegation, playing clips of Mr. Biden’s vow on Feb. 7 that if Russian invaded, “then there will be no longer Nord Stream 2. We will bring an end to it.” U.S. officials said he meant diplomatic and economic action, and noted that Mr. Biden had been proved correct when Germany halted the project.

A former Polish foreign minister, Radek Sikorski, a vociferous critic of Moscow, appeared to support its interpretation of events with a tweet saying, “Thank you, USA” above a photo of a patch of the Baltic Sea being churned by rising methane bubbles.

Reached by telephone on Wednesday, Mr. Sikorski declined to get into specifics about his post, but noted that the Nord Stream projects had bypassed Poland, which has tense relations with Moscow, while deepening Western Europe’s dependence on Russia. “Successive Polish governments have been ripping their veins out to stop Nordstream,” he said.

“Why shouldn’t I be overjoyed?” he added. “I would prefer to think it was rather our allies than our enemies.”

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A painted map of the Nord Stream pipelines on a container near the terminal in Lubmin.Credit...Markus Schreiber/Associated Press

The pipelines were damaged at a critical moment in the seven-month war. Kyiv is making unexpected advances in the battlefield, Moscow has challenged Ukraine’s western backers with thinly veiled threats of nuclear retaliation, Russia seems on the verge of annexing large parts of Ukraine, and Mr. Putin’s order to draft hundreds of thousands of men into the military is meeting broad resistance.

At first glance, it seems counterintuitive that the Kremlin would damage its own multibillion-dollar assets. But there is value for Moscow in fueling European fear, which pushes up prices in the gas market.

And in the short term, analysts say, it is not clear what Mr. Putin stands to lose, having already largely cut off gas deliveries to European countries in recent months.

With both Nord Streams already idle, the damage in the Baltic Sea has no immediate effect on European energy supplies. Some officials said that it might not be a coincidence that a gas conduit from Norway to Poland known as the Baltic Pipe opened on Tuesday. It was conceived to ease Warsaw’s dependence on Russia and passes close to the area where the leaks occurred.

In recent months, Europe has cut its gas consumption, found alternative suppliers and built up its stock, though at a steep price.

“The bad news — from the Kremlin’s perspective — is that weaponization of gas supply is not working as a political strategy,” said Pavel Molchanov, an energy analyst at Raymond James, a U.S. investment bank. “Through its own actions, Gazprom lost nearly all of its market share in Europe.”

On Wednesday, swirling streams of gas continued to escape the three ruptured pipes, roiling the sea surface near the Danish island of Bornholm. The Danish authorities said they had begun a criminal investigation to determine the exact cause of the leaks. The U.S. government offered its assistance.

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The German end of the Nord Stream 1 pipeline and the transfer station of another conduit, the OPAL pipeline, in Lubmin.Credit...Markus Schreiber/Associated Press

While some European officials were quick to speculate about Russian involvement, American officials were more cautious, noting the lack of available evidence.

For all their harsh critiques of Mr. Putin and his government, U.S. officials noted that it had been tempting to blame just about every attack on Russia, sometimes wrongly. In July, there was a widespread assumption in Washington that a major cyberattack on Albania was a Russian effort to undermine a NATO ally; this month, officials said an investigation had concluded the culprit was Iran.

Several officials in Washington noted that nongovernmental actors could have committed the pipeline sabotage. Others said the two detonations registered by seismometers in the region pointed to explosives placed by a submersible or dropped by aircraft or boat, suggesting a state had been involved.

“It’s hard to assess; does anybody benefit?” Finland’s president, Sauli Niinistö, told the news outlet Helsingin Sanomat. “That is why this is a mystery so far.”

Katrin Bennhold reported from Berlin, and David E. Sanger from Washington. Steven Erlanger contributed reporting from Athens.

Katrin Bennhold is the Berlin bureau chief. A former Nieman fellow at Harvard University, she previously reported from London and Paris, covering a range of topics from the rise of populism to gender. More about Katrin Bennhold

David E. Sanger is a White House and national security correspondent. In a 38-year reporting career for The Times, he has been on three teams that have won Pulitzer Prizes, most recently in 2017 for international reporting. His newest book is “The Perfect Weapon: War, Sabotage and Fear in the Cyber Age.”  More about David E. Sanger

A version of this article appears in print on  , Section A, Page 1 of the New York edition with the headline: Burst Pipelines Seen as Attack, But the Mystery Is Who Did It. Order Reprints | Today’s Paper | Subscribe

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