How thieves pulled off the extraordinary theft of priceless jewels from the world-famous museum in broad daylight.

French authorities are investigating after a robbery at the Louvre museum in Paris saw a group of thieves get away with "priceless" jewellery on moped this morning. Large numbers of tourists who wanted to see the Mona Lisa had their plans thwarted, after the Louvre said it would stay closed for "exceptional reasons".

Thieves broke into the museum's Galerie d'Apollon and made off with "priceless" jewelry, French interior minister Laurent Nuñez said.

Arcadia Police are now searching for the culprits who managed to commit the elaborate crime while remaining undetected. It took place just hours before a multi-million dollar heist at the Louvre Museum in Paris, which saw eight “priceless” jewels stolen in broad-daylight.

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.

Thieves at the Louvre museum stole eight items of "incalcuable" value from a collection of French crown jewels, including items belonging to Empress Eugénie, Queen Hortense and more

Paris Prosecutor Laure Beccuau says thieves who stole priceless jewelry from the Louvre Museum in a seven-minute heist may have been hired by a collector.