One day after four men staged a heist of the Louvre Museum, French officials were looking Monday to find the thieves and the priceless jewels they swiped.

The French crown jewels robbed from the Louvre museum in Paris are likely lost forever, an art crime expert tells CBS News, even if the thieves are caught.

Laurence des Cars has been summoned to appear before France’s Senate Culture Committee on Wednesday to an answer questions regarding the museum's security and what may have went wrong on Sunday when nine "priceless" pieces were swiped from the Louvre’s Apollo Gallery.

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

Minutes after the world’s most-visited museum, The Louvre, opened its doors, thieves carried out a daylight heist, stealing “priceless” jewelry on Sunday morning. Here's a look at other notable museum heists.

French police on Tuesday stepped up the hunt for thieves who stole priceless royal jewels from the Louvre museum, as scrutiny mounted over security at the country's cultural institutions.- 'Worrying level of obsolescence' - The heist has reignited a row over the lack of security in French museums,

A group of thieves stole jewelry from Paris' Louvre museum. Here's which items they took, according to officials.