The military intelligence chief has been in custody since 9 December for leaking classified information, which could undermine Denmark's national security and relations with other countries, according to the news outlet.
The decision to arrest Findsen was reportedly made in December. However, back then it was unknown who exactly was arrested. Findsen has also been suspended from office since August.
It was reported last year that the DDIS had allegedly obtained and passed on significant amounts of information about Danish citizens in violation of data privacy laws as well as misled the watchdog that was supposed to hold it accountable.