The man is said to have approached by boat and soldiers and guards took care of him.
The police tell the newspaper that the incident is classified as a violation of the Protection Act.
Gabriel Wernstedt, press secretary at the Security Police, says that this is still the police's case.
TT: Have the police had contact with the Security Police in the case?
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What we can say in general is that we basically have daily contact with the police and exchange information on an ongoing basis.
But regarding who is responsible for a case, there is a clear division, and in this case it is the police, says Wernstedt.
The Armed Forces takes what happened seriously, the communications department states in a comment to TT.
"Military protected objects are a large part of the defense of Sweden and therefore it is important to respect the access ban.
You can also be injured if you enter a protected object.
It can be good to know that the penalty for infringement has been increased and the maximum penalty is now two years' imprisonment ”.