HELSINKI (AP) — The Swedish military said Sunday it had made three credible sightings of foreign undersea activity in its waters during the past few days amid reports of a suspected Russian intrusion in the area.

Rear Adm. Anders Grenstad said the armed forces had observed the activity in the Stockholm archipelago and nearby coastal area, but declined to give details of an operation reminiscent of the Cold War, when Sweden’s armed forces routinely hunted for Soviet submarines in its waters.