French authorities arrested two crew members of an Italian passenger ferry suspected of infecting the ship with malware that could have enabled them to remotely control the vessel.

As the Paris prosecutor’s office announced this week, a Bulgarian national has been released without any charge, while a Latvian suspect who recently joined the crew of the Fantastic ferry (owned by Italian shipping company Grandi Navi Veloci) remains detained and was transferred to Paris on Sunday.

The Latvian crew member now faces charges of conspiring to infiltrate computer systems on behalf of a foreign power after a remote access tool was discovered aboard the ferry, as Le Parisien first reported.