Finnish police said on Thursday they are investigating whether a foreign ship was involved in the damage of an undersea power cable connecting Finland and Estonia following a sudden outage on Wednesday.

Finnish police intend to transport the Eagle S, a Russia-linked tanker the authorities seized after suspecting it of intentionally damaging a Baltic Sea power cable, to shore. The tanker is to be moved from the Gulf of Finland to an anchorage near the Finnish port of Kilpilahti to facilitate the investigation,

The Finnish authorities said the tanker might be part of Russia’s shadow fleet, which emerged as a way to circumvent Western-imposed price caps on Russian oil transported by sea. The caps were introduced several months after President Vladimir V. Putin of Russia ordered the full-scale invasion of Ukraine in February 2022.