The National Times - France examining DNA samples after Louvre heist

Up to "150 DNA samples, fingerprints and other traces" have been identified, Paris prosecutor Laure Beccuau told the Ouest France local newspaper.

She said their analysis was a priority and results within the next days would hopefully provide leads, especially if the culprits had a criminal record.

The thieves on Sunday clambered up the extendable ladder of a stolen movers' truck and, using cutting equipment, broke into a first-floor gallery containing jewels.

They dropped a diamond- and emerald-studded crown as they fled down the ladder and onto scooters, but still made away with eight pieces of jewellery worth an estimated $102 million.

The Louvre's director on Wednesday admitted they had taken advantage of a blind spot in the security surveillance of the museum's outside walls.

But Beccuau said public and private security cameras elsewhere had allowed detectives to track the thieves "in Paris and in surrounding regions".

She said she hoped that, with all the media attention on the robbery, "the robbers will not really dare move with the jewels".

"I want to be optimistic," she said.

The director of the Drouot auction house on Sunday said he feared the jewels would be broken down into gems and precious metal to be sold, as they would be "completely unsellable in their current state".

Items stolen include an emerald-and-diamond necklace that Napoleon Bonaparte gave his wife, Empress Marie-Louise, and a diadem that once belonged to the Empress Eugenie, which is dotted with nearly 2,000 diamonds.

Sunday's brazen theft has made headlines across the world and sparked a debate in France about the security of cultural institutions.

Less than 24 hours after the high-profile break-in, a museum in eastern France reported the theft of gold and silver coins after finding a smashed display case.

F.Morgan--TNT