NBC Boston spoke to an art theft expert who is also the director of security and chief investigator at the Gardner Museum about the logistics of this heist at the Louvre and what the thieves might be planning to do with the crown jewels. The plot was carried out just 30 minutes after the Louvre opened on Sunday morning.

The Louvre, the world’s most-visited museum, abruptly closed on Sunday following a break-in at its Apollo Gallery—the home of France’s crown jewels—in a bold daylight robbery that saw priceless Napoleonic treasures stolen.

Thieves in France pulled off a daring daytime heist Oct. 19 when they stole multiple pieces of priceless jewelry from the Louvre in a matter of minutes about a half hour after the museum opened to the public for the day.

More than 25 years before Sunday's heist at the iconic museum, a thief took a 19th-century painting in broad daylight.

A manhunt is underway to find the four thieves before the jewels - which once belonged to French royals - are broken up.

A Maine State Music Theatre group that visited the Louvre Museum in Paris on Sunday recounted what they witnessed during a theft of crown jewels.

Thieves used a basket lift to break into the Louvre on Sunday morning, forced a window, smashed display cases and escaped with jewels of “inestimable value,” France’s interior minister said, as the world’s most visited museum closed for the day during the investigation.

The Louvre Museum in Paris remains closed to the public after robbers stole imperial jewels in broad daylight on Sunday.