German authorities charged a man with espionage after he allegedly passed floor plans of the country’s parliament buildings in Berlin to Russia’s GRU military intelligence agency, officials say.

The man, identified only as Jens F. in accordance with German privacy rules, worked for a company that carried out electrical maintenance in the Bundestag and other government premises. The Bundestag is located inside the Reichstag.

“The defendant had access to PDF files with the floor plans,” federal prosecutors said in a statement on Thursday, adding that it appears that the man “decided of his own accord” to carry out the act.

Prosecutors say that in 2017, the 55-year old Jens F. sent the PDF files to an officer with Russia’s GRU military intelligence agency, located in the Russian Embassy.