Swedish forces have been scouring the sea off Stockholm since Friday, after what the military called three credible reports of activity by foreign submarines or divers using an underwater vehicle, Reuters reports.
“Today, I can also report that there have been two further observations which were made by members of the public that are interesting enough to require further follow-up work,” Admiral Anders Grenstad told reporters.
He would not give further details about what kind of new sightings had been made, but said they were being assessed and were not yet considered as credible as the three made earlier.
He said Sweden had no information as to which country might be behind the suspected intrusion into Swedish waters. But during the 1980s and early ’90s, Sweden’s defence forces regularly played cat and mouse with suspected Soviet submarines in its territorial waters.