A series of unusual leaks on two natural gas pipelines running from Russia under the Baltic Sea to Germany triggered concerns about sabotage on Tuesday, overshadowing the inauguration of a long-awaited pipeline that will bring Norwegian gas to Poland in efforts to bolster Europe's energy independence from Moscow.

Polish Prime Minister Mateusz Morawiecki called the events “an act of sabotage", while Danish Prime Minister Mette Frederiksen said she could not rule it out after three leaks were detected over the past day on the Nord Stream 1 and 2 pipelines, which are filled with gas but not delivering the fuel to Europe.

An energy standoff over Russia's war in Ukraine halted flows on Nord Stream 1 and prevented them from ever starting in the parallel Nord Stream 2.

Frederiksen, Morawiecki and Polish President Andrzej Duda symbolically opened a valve of a yellow pipe belonging to the Baltic Pipe, a new system that will bring Norway's gas across Denmark and the Baltic Sea to Poland.

"The era of Russian domination in the gas sphere is coming to an end," Morawiecki declared. “An era that was marked by blackmail, threats and extortion.”

No official presented evidence of what caused the Nord Stream problems, but in central Europe, where distrust of Russia runs high, there were fears that Moscow sabotaged its own infrastructure out of spite or to warn that all pipelines are vulnerable to attack.

The leaks emerged off the coast of Denmark and Sweden, raising the stakes on whether energy infrastructure in European waters was being targeted and leading to a small bump in natural gas prices.

“We can clearly see that this is an act of sabotage, an act that probably means a next step of escalation in the situation that we are dealing with in Ukraine,” Morawiecki said.

Anders Puck Nielsen, a researcher with the Centre for Maritime Operations at the Royal Danish Defence College, said the timing of the leaks was “conspicuous” given the ceremony for the Baltic Pipe.