NATO and its eight Baltic Sea allies say they are stepping up efforts to deter 'any attempts at sabotage' in the wake of a series of incidents that have damaged key undersea power and telecommunications cables.

Amid a series of incidents that have damaged critical cables in the Baltic Sea, intelligence services in the U.S. and Europe are increasingly convinced that they were caused by accidents, according to a report by the Washington Post on Jan.

NATO warships began patrolling the Baltic Sea this week. Some of the ships are anchored in Tallinn's Mine Harbor, ERR reports. Warships have begun patrolling as part of the Baltic Guard program. Three NATO ships anchored in Tallinn.