Des Cars stressed security improvement is a priority of the decade-long "Louvre New Renaissance" plan launched earlier this year, with an estimated cost of up to 800 million euros ($933 million), to modernize infrastructure, ease crowding and give the Mona Lisa a dedicated gallery by 2031.

A person suspected of being the fourth member of the main gang that robbed the Louvre last month has been arrested, reported Le Parisien paper on Tuesday.

The head of the Louvre museum said Wednesday that new surveillance cameras and anti-intrusion systems will soon be installed at the Paris landmark after last month's stunning jewel heist.

The Louvre said it will close the Campana Gallery while experts investigate the weakened beams supporting part of the second floor in the museum's Sully wing.