The French government says thieves who broke into a vehicle at a Paris train station made off with a USB drive and discs containing floor plans for the French presidential palace, the country's main security agency and the Paris police department.

A building contractor doing work on the government buildings parked and briefly left his vehicle on Saturday. When he returned, the unencrypted electronic blueprints were gone, according to the Interior Ministry, whose floor plan was among those stolen.

In a statement, the Interior Ministry said Tuesday that the stolen documents weren't classified and that their disappearance put no one in danger.