Sabotage cannot be ruled out as the cause of three leaks detected on two Russia-to-Germany Nord Stream gas pipelines, Danish Prime Minister Mette Frederiksen said on Tuesday.

“We certainly cannot rule it out,” she said while on a visit to Poland to open the new Baltic Pipe linking Poland and Denmark with Norway’s offshore gas fields. “It is too early to conclude yet, but this is an extraordinary situation and there are three leaks, so it is hard to imagine that it could be a coincidence.”

Polish Prime Minister Mateusz Morawiecki had fewer doubts.

“We do not yet know the details of what happened, but we can clearly see that it is an act of sabotage,” he said at the joint appearance with Frederiksen, calling it “the next stage in the escalation of the situation we are facing in Ukraine.”

Two of the leaks were near the double Nord Stream 1 pipeline, to the northeast of Denmark’s Bornholm island, and one leak was reported near the Nord Stream 2 pipeline off the southeastern coast of the island, the Danish Maritime Authority said on Tuesday. The incidents are just beyond Denmark’s territorial waters, with two in Denmark’s exclusive economic zone and one in Sweden’s exclusive economic zone — areas where the sea has the status of international waters.

Sweden’s national seismic network detected two distinct blasts in the area on Monday, one at 2:03 a.m. and the second at 7:04 p.m., reported national broadcaster SVT.

A no-go zone of 5 nautical miles was established around each of the sites, which are at a likely depth of 60 meters to 70 meters, Baltic maritime agencies said.

The Danish military released pictures of clouds of gas bubbles roiling the surface of the sea.

Asked on Tuesday if the leaks were the result of sabotage, Kremlin spokesperson Dmitry Peskov said: “We cannot rule out any possibility right now. Obviously, there is some sort of destruction of the pipe. Before the results of the investigation, it is impossible to rule out any option.”

“This is a completely unprecedented situation that requires an urgent investigation,” he added.

Nord Stream 2, which is not in operation, was nonetheless filled with 177 million cubic meters of natural gas — worth €358 million at current prices — to bring pipeline pressure up to 300 bar in anticipation of being allowed to flow. Germany froze approval of the pipeline after Russia’s invasion of Ukraine.

At the German landfall, pipeline pressure was registering 7 bar, the German infrastructure regulator said on Monday.

“Today we were informed by the network operator Gascade that there has been a sharp drop in pressure in the Nord Stream 2 pipeline,” the infrastructure regulator said in an emailed statement. “We still have no clarity about the causes and the exact facts.”

The double-string undersea gas link runs 1,200 kilometers through Russian, Finnish, Swedish, Danish and German territorial waters.

Nord Stream 2 AG, the pipeline owner and operator, did not respond to requests for comment. The pipeline is owned by Russia’s Gazprom.

The parallel Nord Stream 1 pipeline was fully opened in 2012. It has a capacity of 55 billion cubic meters a year, but Russia has stopped sending gas through to Germany, claiming that the pipeline needs maintenance. German politicians accuse the Kremlin of feigning repairs to retaliate against the EU’s support for Ukraine.

Nord Stream AG, the company that owns Nord Stream 1 and is a consortium in which Gazprom has a majority stake and includes four Western energy firms, said on Monday evening: “The dispatchers of the Nord Stream 1 control center registered a pressure drop on both strings of the gas pipeline. The reasons are being investigated.”

Given it took weeks for Nord Stream 2 to be filled with that amount of gas, the speed of the pressure drop — virtually overnight — pointed to the possibility of a major leak rather than any attempt on the Russian side to siphon back gas supplies, according to several officials not authorized to speak publicly.

‘Improbable’ leaks

“It seems extremely improbable that the leaks on two different pipelines happen at the same time. Therefore I think we should assume that it was intentional to create these leaks,” said Mateusz Kubiak, managing partner at the Warsaw-based Esperis consultancy. He added that he did not think it would make sense for the West or Ukraine to sabotage the pipelines, “Especially as the gas flows were already halted, in the case of Nord Stream 1, or had never started in the case of Nord Stream 2.”

A European Commission spokesperson said Tuesday: “At this stage, it’s very premature to speculate on what the causes are. As I said, we have been informed by the member states concerned, and the member states are looking into this issue. We will remain in close contact with them.”

The price on the EU’s benchmark TTF gas hub was up by 17 percent to around €205 per megawatt hour on Tuesday afternoon — still far below August’s peak of €346 per MWh.

“Prices have slightly risen this morning. However, you’ve got leaks on two pipelines, which were not flowing gas, and which I think it’s fair to say the market did not expect to flow gas anytime soon. So I think the impact will be rather limited,” said Stefan Ulrich, European gas senior associate at BloombergNEF.

A spokesperson for Germany’s economy ministry said: “We do not see any impact on the security of energy supply.”

Unlike oil spills, natural gas — also known as methane — bubbles up to the surface. However, there are climate consequences. It is highly flammable and has such a potent global warming effect that it has been likened to “CO2 on steroids.”

“As soon as the gaseous methane rises above the sea surface into the atmosphere, it contributes massively to the greenhouse effect,” said Sascha Müller-Kraenner, federal director of NGO Environmental Action Germany.

“The significant drop in pressure that has already occurred in the Nord Stream 2 pipeline gives reason to fear that this is a major accident and that significant quantities of the dangerous greenhouse gas methane have already leaked into the Baltic Sea,” said Müller-Kraenner.

Additional reporting by Karl Mathiesen and Hans von der Burchard.

This article has been updated with the territorial location of the explosions.