STOCKHOLM, Sweden (PNN) - October 16, 2022 - Sweden has refused to join a joint international investigation into the recent attack on the Russian-owned Nord Stream 1 and 2 pipelines, citing national security concerns.

According to Mats Ljungqvist, the Swedish prosecutor involved in the country’s criminal investigation of the leaks in the Swedish economic zone, the country will not join a Eurojust Joint Investigation Team, which would require them to share their findings with Germany and Denmark.

Sweden notably reported the detection of underwater explosions on September 26, shortly after which large patches of roiling gas could be seen on the surface in the same area. Nearly two weeks later, Sweden's domestic security agency said their initial investigation into the explosions had "strengthened the suspicions of serious sabotage."

Eurojust - an EU agency that coordinates judicial cooperation in criminal matters among member state agencies - said the Joint Investigation Team is "one of the most advanced tools used in international cooperation in criminal matters, comprising a legal agreement between competent authorities of two or more States for the purpose of carrying out criminal investigations."

On Friday, Germany's interior ministry said that the German Federal Police had completed their part of the investigation and turned in their findings.

Sweden's concerns over joining the team - which typically take 12-24 months to investigate - is "directly linked to national security," according to Ljungqvist.

Ljungqvist’s remarks come after German news website Der Spiegel reported a similar situation, citing unnamed German security sources. It said that Sweden had rejected the idea of sharing information it uncovered from its probe into the Nord Stream leaks with Germany and Denmark, saying that “the confidentiality level of the results of its investigation was too high to share them with other states.”

Ljungqvist noted that outside of the proposed formal investigation team, Sweden had otherwise been cooperating with Denmark and Germany in investigating the Nord Stream leak.

Days earlier, Sweden said they weren't willing to share information with Russia regarding their investigation.

"In Sweden there is secrecy around preliminary investigation and that also applies in this case," said outgoing PM Magdalena Andersson in an October 11 statement.

A Swedish Security Services spokesman said they are working with “other authorities,” including internationally, as part of their own investigation.

A total of four leaks were detected on the Nord Stream pipelines - two on Nord Stream 1 and two on Nord Stream 2 - in late September, sparking widespread suspicions and concerns, including by NATO, of sabotage. While both Nord Stream pipelines, which travel through the Baltic Sea from Russia to Germany, were not in operation, both were filled with gas that leaked to the surface of the water. Nord Stream 1 had recently stopped supplying gas and Nord Stream 2 never began operating.

Chief of Russia’s Foreign Intelligence Service told the Russian TASS news agency on Friday that they have intelligence data on sabotage at the two pipelines but did not elaborate.