(PARIS) — Several people disguised as construction workers broke into the world-famous Louvre Museum in Paris on Sunday, cracking open display cases and stealing jewelry that once belonged to Emperor Napoleon and his wife, officials said.

At least nine pieces of jewelry of “inestimable heritage and historical value” were taken in the brazen heist before the thieves made their getaway on motorcycles, two ministers said.

“Investigations have begun, and a precise list of the stolen items is underway,” the museum said in a statement.

Four thieves pulled off the apparently well-planned heist, according to authorities.

The theft took place around 9:30 a.m. local time on Sunday, just before the museum was set to open to the public, the Paris Police Prefecture said in a statement.

The team of

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