The Louvre was

Officials said a team of 60 investigators was working on the theory that an organised crime group was behind the theft Sunday of nine pieces of jewellery, one of which -- a crown covered in more than 1,000 diamonds -- they dropped in the streets of Paris as they fled.

As disappointed tourists rebooked tickets to the world's most visited museum, the heist -- which lasted just seven minutes -- also reignited a row over the lack of security in France's museums, after two other institutions were hit last month.

Justice Minister Gerald Darmanin admitted to flaws in securing the Louvre.

"What is certain is that we have failed, since people were able to park a furniture hoist in the middle of Paris, get people up it in several minutes to grab priceless jewels, giving France a

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