What we know about the evidence left at the scene of the Louvre jewel heist

As the hunt for the thieves who stole over $100 million worth of jewels from the Louvre Museum in Paris stretched into its fifth day on Thursday, veteran detectives who have probed similar cases said French investigators have a lot of evidence to work with. Chief among the clues police have recovered at the scene of Sunday's sensational crime at one of the world's most famous museums are traces of DNA found on items the thieves left behind in their hasty motorbike getaway. "That's a tremendous piece of evidence to have recovered, to actually have DNA," Geoffrey Kelly, a retired FBI agent who was on the bureau's art crime team, told ABC News. "We've always typically thought of fingerprints as the way to catch bad guys, but DNA is really 21 st -century technology." The DNA, which investigato