"At the very least, the managers were a little careless," said a police source yesterday, adding that the security system in place at the Carlton -- a hotel popular with film stars -- was "a bit out of date".
Police said they had not been alerted that the "Extraordinary Diamonds" exhibition, put on by a group owned by Israeli billionaire Lev Leviev, was taking place.
The exhibit was held in a wing of the hotel with direct access to the street.
While not a legal requirement, alerting the police would ordinarily be standard procedure for luxury hotels such as the Carlton.
"For three years now, the Carlton has not informed us when it puts on this kind of event," said the police source.
Hotel management used to oversee security but in recent months the task had fallen to a single manager who was previously responsible for purchasing and laundry, said police. "He has training but that doesn't make him a security professional," said the source.
Its director, Francois Chopinet, told AFP in an email that "no client at the hotel or staff" was implicated in the incident.
InterContinental Hotels Group, to which the Cannes hotel belongs, was not available for comment.
Hotel employees and unions at the hotel have laid the blame firmly with the Carlton.
According to union member Ange Romiti, the security in the room was "not suitable" for the exhibition.
The heist took place on Sunday when a man armed with a semi-automatic pistol walked into the hotel, then proceeded to steal the jewels.
According to a source close to the investigation, the man was "well informed, because he acted at the right moment, in the right place".
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