HELSINKI, Finland — Finnish investigators looking at damage to a Baltic Sea power cable and several data cables said they found an anchor drag mark dozens of miles long on the seabed, apparently from a Russia-linked vessel that has been seized.

The discovery heightened concerns about suspected sabotage by Russia’s “shadow fleet” of fuel tankers — aging vessels with obscure ownership acquired to evade Western sanctions.

The Estlink-2 power cable, which transmits energy from Finland to Estonia across the Baltic Sea, was ruptured Wednesday.

It had little impact on services but followed damage to two data cables and the Nord Stream gas pipelines, both of which have been termed sabotage. — Associated Press