The Louvre reopened its doors to visitors on Wednesday, three days after it was closed due to the theft of precious royal jewelry, AFP reports.

From 9:00 a.m. (07:00 GMT), the museum’s regular opening time, the first visitors began entering the world-renowned institution, although the museum announced that the “Apollo” gallery, where the theft occurred on Sunday, remains closed.

Dozens of investigators are searching for those responsible for Sunday’s events, pursuing the theory that an organized criminal group climbed a truck via a ladder to enter the museum, and dropped a diamond-studded crown while fleeing.

Eight priceless pieces were stolen, including a necklace of emeralds and diamonds that Napoleon I had gifted to his wife, Empress Marie Louise, and a diadem once belonging to Empress Eugénie, adorned with nearly 2,000 diamonds. Disappointed tourists were denied access to the Louvre, located in central Paris, the day after the theft, and it remained closed on Tuesday according to its normal schedule. Last year, the world’s most visited museum welcomed nine million visitors to its extensive halls and galleries.

The theft has sparked renewed controversy over the lack of security in French museums, following attacks on two other institutions last month.