A terrestrial Internet cable connecting Sweden and Finland was cut in two separate locations.
The cut to the Global Connect cable on Monday caused outages, with more than 6,000 private customers and 100 business customers affected. The issue comes after cuts to Baltic Sea cables.
Global Connect said that 6,000 private customers and some 100 business customers were affected.
Swedish Civil Defense Minister Carl-Oskar Bohlin said "sabotage" was suspected, while Finnish Transport and Communications Minister Lulu Ranne said that "authorities are investigating the matter together with the company."
Ranne added: "We are taking the situation seriously."
However, in a brief statement, the Finnish police service said that it was not currently conducting a criminal investigation.
Global Connect said that the first cable cut was repaired and most services were returned, but that the second cut was still being worked on. Both cuts happened in Finnish territory.
Last month, a subsea cable connecting Finland to Germany was severed. A few hours later, a subsea cable between Sweden and Lithuania was similarly cut.
Investigators have surrounded the Yi Peng 3, a Chinese bulk carrier that sailed across both Baltic Sea cables. It is believed to have dragged its anchor for some 111 miles along the sea bed, tearing both cables apart.
Investigators are now looking into whether Russian intelligence officials ordered the cable’s destruction, with the ship having last docked at the Russian port of Ust-Luga to pick up a delivery of Russian fertilizer.
Earlier this year, during the Paris Olympics, a number of terrestrial cables were mysteriously cut in southern France. It echoed a similar wave of apparent targeted attacks two years ago which impacted cables across France.
Russia has been accused of waging hybrid warfare with Nato members as part of its ongoing invasion of Ukraine.
Speaking on the Baltic Sea cuts, Kremlin spokesperson Dmitry Peskov said that it was "quite absurd to continue to blame Russia for everything without any reason."
