Sweden’s Security Service suspects the leak to be deliberate.

Last week, seismologists detected a string of explosions in the ocean around the Nord Stream gas pipeline linking Russia and Germany. These explosions resulted in a severe leak in the pipeline, which launched large quantities of methane gas out of the ocean and into the atmosphere.

Following the reveal of the leak, there were immediate suspicions of deliberate sabotage, but nothing could be confirmed at the time. However, following a week of investigation by Sweden’s Security Service, the potential of sabotage has become more likely.

According to an official statement, the investigation uncovered evidence of deliberate detonations at the leak site which have “strengthened the suspicions of gross sabotage.” The service also added that “certain seizures have been made” related to the investigation, though the statement does not elaborate further.

The service has refrained from identifying any potential suspects that could’ve perpetrated the sabotage, as they still need more evidence before they could make such an accusation.

“The continued preliminary investigation must show whether someone can be served with suspicion and later prosecuted,” Sweden’s Security Service said.

Russia is currently the prime suspect outside of the investigation, with members of the EU proposing that Russia sabotaged the pipeline as an indirect attack against the EU for aiding Ukraine against their invasion. Russia has dismissed the claims.