The Louvre remained closed Monday after historic jewels were stolen in a daring daylight heist. Thieves used a basket lift to access the museum, smashed display cases, and fled with Napoleonic jewels.

The Louvre Museum in Paris remains closed after a brazen daylight heist that took place on Sunday resulted in eight missing pieces of Napoleonic jewelry. Prosecutors in Paris said on Tuesday that the stolen jewels were worth an estimated $102 million ($88 million euros).

About 100 investigators are now involved in the police hunt for the gems and heist suspects​, said prosecutor Laure Beccuau, whose office is leading the investigation.

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.

PARIS and LONDON -- 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.

The Empress Eugénie's crown is exhibited at the Louvre Museum on April 27, 2025 in Paris, France. The world-renowned Louvre museum in Paris was shut on Oct. 19 after several pieces of invaluable jewelry were stolen in a brazen robbery. Zhang Weiguo/VCG via Getty Images

The masked gang, who remain at large, made off with nine items, including a crown, a tiara, necklaces and earrings.

The president of the Louvre admitted on Wednesday that the external video surveillance system of the establishment is "very insufficient", three days after the spectacular theft of eight jewels, an incident that revived the question about security in French museums.