Investigators were looking into the alarm systems at an institution that one expert said “wasn’t built with an obsession over security.”

More than 25 years before Sunday's heist at the iconic museum, a thief took a 19th-century painting in broad daylight.

A new video has emerged showing what could be the Louvre thieves in action as they carried out Sunday’s daylight robbery at Paris’s world-famous museum. The footage, obtained by French broadcaster BFMTV, purportedly shows what has been called one of the most brazen art thefts in recent memory.

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

By Gabriel Stargardter, Juliette Jabkhiro and Elissa Darwish PARIS (Reuters) -Crime gangs around Europe are increasingly robbing valuable jewels and gold from cash-needy museums like the Louvre, but while police often catch the thieves,

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".

The Louvre, the world's most iconic museum, remained closed Monday after thieves stole priceless treasures from the Apollon Gallery, the home of the French crown jewels.

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.

Myles Connor walked into the Museum of Fine Arts in Boston, and walked out with a Rembrandt painting in the 1980s.

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.