The Paris prosecutor says five more people have been arrested in the investigation into the theft of crown jewels from the Louvre Museum. The jewels are still missing.

The Count of Paris, whose great-grandmother once wore the sapphire tiara stolen from the Louvre Museum, has pleaded with the robbers to return the stolen jewels intact for the sake of France's heritage - and for his family.

The precious artifacts snatched from Paris’s Louvre Museum on Sunday include an emerald necklace gifted by Napoleon to his second wife and other priceless crown jewels.

French senators have acknowledged that the Louvre's security is outdated and needs urgent upgrades. On Tuesday, a delegation visited the museum following a recent heist where thieves stole jewels worth 88 million euros in under eight minutes.

Authorities were racing Monday to reassure the public about security at key cultural sites — and find the jewels stolen from the museum before they can be broken up and melted down.

As a deadline fast approaches to either charge to release two suspects in the $102 million Louvre jewel heist, the president of France's Senate Culture Committee said the museum is "not up to standard" for guarding it against other bandits.