The Swedish prosecutor leading the Nord Stream investigation, Mats Ljubfqvist, said that traces of explosives were found at the gas pipeline leaks, confirming that the explosions at the end of September were an act of sabotage. At the same time, the prosecutor warned that “the preliminary investigation is very complex and extensive” and that therefore the work of investigators from Sweden, Denmark and Germany continues. The leaks occurred in international waters, but within the exclusive economic zones of Denmark and Sweden. Nord Stream 1 transported Russian gas to Germany until Moscow cut off supplies at the end of August. Nord Stream 2 never entered service because Germany suspended the certification process shortly before Russia invaded Ukraine. Kremlin spokesman Dmitry Peskov said that “it is very important not to stop, to find out who is behind” the explosions involving the Nord Stream 1 and 2 pipelines in late September. NATO and its European partners have increased patrols around critical infrastructure in the Baltic and North Sea, home to a vast network of cables and pipelines connecting Norway, currently Europe’s most important energy exporter, to Britain and the European mainland.