The Meaux prosecutor Dominique Laurens said today that searches of the man's phone records and various locations turned up no link with terrorism. She said the man was moving house and feared his weapons would be misplaced or taken.
The man was detained yesterday along with his female partner, who was cleared of complicity, the statement said. He remained jailed today.
No one was hurt, and the park, Europe's most-visited tourist attraction, remained open after the arrests at the New York Hotel.
