Three of the four people whom the police believe carried out the theft have been arrested. But the jewelry is nowhere to be found.

Much of the blame has been placed on the Louvre’s security camera system. The building’s exterior is “surrounded by cameras,” but there “were not enough officers to continuously monitor the feeds.” Other factors include the museum’s ongoing construction,

Louvre Museum in Paris, a prosecutor says there's no sign of the missing jewels, and still only 2 people in custody.

The dragnet tightened around the Louvre thieves on Thursday. Five more people were seized in the crown-jewels heist — including a suspect tied by DNA — the Paris prosecutor said, widening the sweep across the capital and its suburbs.