CNN —

It's the smoking gun behind the most spectacular heist this side of the Millennium.

A French court released a report Thursday slamming the leadership of the Louvre for its focus on headline-grabbing purchases and renovation projects over maintaining the security of on of the world's largest museums.

The audacious daytime robbery, which saw four men walk away with priceless historic jewellery, was a "deafening alarm signal," Pierre Moscovici, president of the Court of Accounts, which authored the report, told journalists Thursday.

Echoing the report, which was commissioned before the October 19 heist, he said that the museum leadership had prioritized "visible and attractive" projects, like art purchases and revamping the museum layout at the detriment, notably, of the Louvre'

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