World

Sweden enters 3rd day of undersea investigation of suspected foreign activity

  • Swedish  Navy minesweeper HMS Kullen, foreground,   patrols  in the Stockholm Archipelago, Sweden,  Sunday Oct. 19 2014.  A Swedish military search for evidence of suspected undersea activity in its waters has entered its third day amid reports of a suspected Russian intrusion.  (AP Photo / TT News Agency / Marko Saavala)   SWEDEN OUT

    Swedish Navy minesweeper HMS Kullen, foreground, patrols in the Stockholm Archipelago, Sweden, Sunday Oct. 19 2014. A Swedish military search for evidence of suspected undersea activity in its waters has entered its third day amid reports of a suspected Russian intrusion. (AP Photo / TT News Agency / Marko Saavala) SWEDEN OUT  (The Associated Press)

  • Two Swedish Navy fast-attack craft patrol  in the Stockholm Archipelago, Sweden,  Sunday Oct. 19 2014.  A Swedish military search for evidence of suspected undersea activity in its waters has entered its third day amid reports of a suspected Russian intrusion.  (AP Photo/TT News Agency / Marko Saavala)   SWEDEN OUT

    Two Swedish Navy fast-attack craft patrol in the Stockholm Archipelago, Sweden, Sunday Oct. 19 2014. A Swedish military search for evidence of suspected undersea activity in its waters has entered its third day amid reports of a suspected Russian intrusion. (AP Photo/TT News Agency / Marko Saavala) SWEDEN OUT  (The Associated Press)

  • Swedish navy  corvette HMS Visby  patrols in the Stockholm Archipelago, Sweden,  Sunday Oct. 19 2014.  A Swedish military search for evidence of suspected undersea activity in its waters has entered its third day amid reports of a suspected Russian intrusion.  (AP Photo/TT News Agency / Marko Saavala)   SWEDEN OUT

    Swedish navy corvette HMS Visby patrols in the Stockholm Archipelago, Sweden, Sunday Oct. 19 2014. A Swedish military search for evidence of suspected undersea activity in its waters has entered its third day amid reports of a suspected Russian intrusion. (AP Photo/TT News Agency / Marko Saavala) SWEDEN OUT  (The Associated Press)

A Swedish military search for evidence of suspected undersea activity in its waters has entered its third day amid reports of a suspected Russian intrusion.

The military has declined to comment on the operation except to say it is searching for evidence of "foreign underwater activity."

Daily Svenska Dagbladet reported the Swedes had picked up an emergency message suggesting a Russian mini-submarine had run into trouble in Swedish waters.

Anders Nordin from the Swedish Maritime Administration says a Russian-owned oil tanker, which had reportedly been circling near Swedish waters for days, turned Sunday and sailed to the north-east.

Media reports said the tanker's moves might be connected to the search.

The operation was reminiscent of the Cold War, when Sweden's armed forces routinely hunted for Soviet submarines in its waters.