"This is news to us as well, so we have not had time to take stock of the information that has come out. We also do not know why he has been arrested. We are following developments," Chief Prosecutor Ingrid Isgren said in a statement.
The Authority said any preliminary investigation could be reopened as long as the suspected crime had not passed the statute of limitations, adding the alleged offence in the dropped Assange investigation would expire in August 2020.
(With inputs from agencies.)