Cables connecting Finland with Germany, and Lithuania with Sweden, have been disrupted, just weeks after the United States warned that it had detected increased Russian military activity around key undersea cables.

European officials are looking toward Russia after two submarine internet cables in the Baltic Sea were suddenly disrupted in an apparent sabotage operation, just weeks after the United States warned that Moscow was likely to target critical undersea infrastructure.

A communication cable connecting Lithuania and Sweden through the Baltic Sea was cut on Sunday morning. Telia, a Lithuanian telecommunications company, reported the incident. The disruption occurred at around 10:00 AM.

The C-Lion1 cable between Finland and Germany was severed in the Baltic Sea, its operator said, after damage was reported to another cable linking Lithuania and Sweden.

U.S. allies warned of "hybrid warfare" Tuesday after two undersea communication cables were severed in the Baltic Sea, raising suspicions that they may be the latest acts of sabotage targeting the West as it clashes with Russia.

Over the weekend, an undersea telecommunication cable lying at the bottom of the Baltic Sea was damaged. "If it is mechanical or physical damage, it is most likely intentional," commented the head of the Lithuanian National Crisis Management Centre.