Braže said Latvia is investigating the incident in coordination with Estonia, Finland, Sweden, Norway, and other countries to determine exactly what happened. “We have made some progress, but I cannot provide details as this information is classified.

The Arelion submarine cable, which connects the Swedish island of Gotland to Lithuania, and the C-Lion 1 submarine communications cable that runs between Finland's capital Helsinki and the German city of Rostock were also damaged in mid-November near Sweden's territorial waters.

On Sunday morning, an undersea fiber-optic cable belonging to the Latvian State Radio and Television Center (LVRTC) was damaged in the Baltic Sea, the center reported.