<div><span style="font-size: 1rem;">Europe was investigating leaks in two Russian gas pipelines that churned up the Baltic Sea on Tuesday and raised concerns from Copenhagen to Moscow about sabotage on infrastructure at the heart of an energy standoff.</span><br></div><div><br></div><div>However, it remained far from clear who might be behind any foul play, if proven, on the Nord Stream pipelines that Russia and European partners spent billions of dollars building.</div><div><br></div><div>Poland's prime minister blamed sabotage for the leaks, without citing evidence, while the Danish premier said it could not be ruled out.</div><div><br></div><div>Russia, which slashed gas deliveries to Europe after the West imposed sanctions over Moscow's invasion of Ukraine, said sabotage was a possibility and that the incident undermined the continent's energy security. A senior Ukrainian official called it a Russian attack to destabilise Europe, without giving proof.</div><div><br></div><div>The Nord Stream pipelines have been flashpoints in an escalating energy war between European capitals and Moscow that has pummelled major Western economies, sent gas prices soaring and sparked a hunt for alternative energy supplies.</div><div><br></div><div>Sweden's Maritime Authority issued a warning about two leaks in the Nord Stream 1 pipeline the day after a leak on the nearby Nord Stream 2 pipeline was discovered that prompted Denmark to restrict shipping and impose a small no fly zone.</div><div><br></div><div>Denmark's armed forces released a video showing bubbles boiling up to the surface of the sea. The largest gas leak had caused a surface disturbance of well over 1 km (0.6 mile) in diameter, the armed forces said.&nbsp;</div><div><br></div><div>"Today we faced an act of sabotage, we don't know all the details of what happened, but we see clearly that it's an act of sabotage, related to the next step of escalation of the situation in Ukraine," Polish Prime Minister Mateusz Morawiecki said at the opening of a new pipeline between Norway and Poland.</div><div><br></div><div>Seismologists in Denmark and Sweden registered powerful blasts in the areas of the leaks on Monday, Sweden's National Seismology Centre told public broadcaster SVT. German geological research centre GFZ also said a seismograph on the Danish island of Bornholm had twice recorded spikes on Monday. - Reuters&nbsp;</div><div><br></div><div>bnbd24/fas</div>