Sweden says "at least one" foreign submarine may have been operating in its waters off Stockholm.
Rear Admiral Anders Grenstad told reporters in the Swedish capital on October 24 that such foreign underwater activity was "unacceptable."
Grenstad was speaking hours after the Swedish military announced it had called off its search for a suspected foreign submarine in waters close to Stockholm after a week-long hunt.
The search, which involved battleships, minesweepers, helicopters and more than 200 troops, had prompted speculation that the source of the suspicious underwater activity was a damaged Russian submarine.
Moscow has denied the claims, blaming a Dutch submarine for triggering the hunt.
The Netherlands has rejected the accusation. Swedish military officials haven't blamed any country for the suspected intrusion.
Based on reporting by AFP, AP, and Reuters