The Flora 1, which has unclear flag status and was sailing from a Gulf of Finland port toward an unknown destination, now sits at anchor near Ystad as prosecutors lead an environmental crime investigation.
Authorities in Latvia launched a criminal probe after another critical telecom line was damaged near Liepāja just days after another was struck between Finland and Estonia.
Swedish authorities detained Malta-registered vessel Vezhen following suspected sabotage of undersea fiber optic cable connecting Latvia's Ventspils with Gotland island.