The Nord Stream 1 and Nord Stream 2 pipelines sustained significant damage last week as a result of “detonations,” according to the Swedish Security Service’s initial investigation.
The agency also said the leaks from the two Russian gas pipelines in the Baltic Sea “has strengthened the suspicions of serious sabotage” as the cause.
Last week, undersea explosions ruptured Nord Stream 1 and Nord Stream 2, at two locations off Sweden and two off Denmark. The pipelines were built to carry Russian natural gas to Germany.
While Vladimir Putin accused the West of attacking the pipelines, the US and its allies have vehemently denied it.
The agency did not give details about its investigation, but in a separate statement Swedish prosecutor Mats Ljungqvist said: “Seizures have been made at the crime scene and these will now be investigated.”
Danish authorities said the two leaks they were monitoring in international waters stopped over the weekend. One of the leaks off Sweden also appeared to have ended.
A Kremlin spokesperson on Thursday said he did not think the investigation could be objective without Russia’s participation after Russia had not been invited to take part.