P ARIS -- As the alarms sounded at the Louvre Museum on Sunday morning, four suspects took off on two motorbikes, winding their way through central Paris, allegedly carrying with them a haul of "priceless" jewelry once worn by queens and royals.

The brazen robbery on Sunday has put a spotlight on security protocols in the sprawling museum, which have been tested over the years by break-ins and thefts.

Thieves broke into the Louvre in Paris — the world's most visited museum — early Sunday morning. Museum officials said they stole jewelry and fled.

Thieves stole jewelry worth millions from the Louvre Museum in Paris, France, on Sunday, Oct. 19. The popular tourist attraction remained closed in the hours since the incident amid a police investigation,

Prosecutor Laure Beccuau, whose office is leading the investigation, said about 100 investigators are now involved in the police hunt for the suspects and gems after Sunday’s theft.

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.

The Louvre posted on X that it was closed for the day "for exceptional reasons." It has remained closed to the public since. The Los Angeles County Sheriff's Department is investigating the fatal shooting of a man who allegedly groped and attacked Compton customers and employees.

The Louvre in Paris was robbed of priceless jewels in a flawless heist. The theft joins a historic list of museum robberies around the world.