A power cable connecting Finland and Estonia under the Baltic Sea suffered a power outage on Wednesday, prompting an investigation, according to the Finnish prime minister. The electrical transmission through the Estline 2 connection between the two European nations was cut on Wednesday afternoon local time.

Police and media reports say that Finnish authorities have detained a Russia-linked ship as they investigate whether it damaged a Baltic Sea power cable and several data cables.

Finland is investigating the possible Christmas Day “sabotage” of an undersea power cable linking the country with Estonia under the Baltic Sea.