The results of the survey were eagerly awaited.
The explosions that hit the Nord Stream 1 and 2 gas pipelines in the Baltic Sea in September, built to transport Russian gas to Europe, are part of sabotage, the prosecutor in charge of the preliminary investigation in Sweden announced on Friday.
"The analyzes that have been carried out show remnants of explosives on several of the foreign objects discovered," prosecutor Mats Ljungqvist said in a statement.
“The continuation of the preliminary investigation will be able to show if someone can be prosecuted for a crime,” added the prosecution.
VIDEO.
Nord Stream 1: underwater images of the gas pipeline destroyed by explosions
Four huge gas leaks had been detected on the gas pipelines linking Russia to Germany at the end of September, all in international waters.
Two are in the Swedish economic zone and two in the Danish one.
Preliminary underwater inspections had reinforced suspicions of sabotage, as the leaks had been preceded by explosions, according to investigators.
Explosions in the middle of the Russian-Ukrainian conflict
The Nord Stream consortium, of which the Russian Gazprom is the majority shareholder, sent a civilian ship under the Russian flag at the end of October to carry out an inspection in the Swedish zone.
In November, Nord Stream also received authorization to inspect the gas pipelines in the Danish area, where another investigation is underway.
Since Moscow's invasion of Ukraine, the two pipelines, which connect Russia to Germany, have been at the heart of geopolitical tensions, stoked after Moscow's decision to cut off gas supplies to Europe in retaliation presumed against Western sanctions.
Out of service at the time of the events, the two gas pipelines nevertheless contained large quantities of methane, which escaped for several weeks causing impressive bubbling.