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.

Two undersea cables in the Baltic Sea were cut, with at least one physically damaged. A cable between Lithuania and Sweden was cut on Sunday morning. The second disrupted cable, about 60 to 65 miles from the first,

An undersea fibre optic cable between Germany and Finland has stopped working and might have been deliberately cut by an unknown party, according to authorities.