The concierge who took armed robbers up to Kim Kardashian West's suite is a "critical witness" in the case.

Kim Kardashian West

Kim Kardashian West

The 'Keeping Up With the Kardashians' star flew out of Paris, France, hours after she was tied up and locked in her bathroom before thieves stole millions of dollars worth of jewellery on Monday (03.10.16), but she has spoken to local police by phone in an "extensive interview".

According to TMZ, she told police: "He opened the door and led them [the robbers] up and was in there the whole time."

Kim stressed how calm the member of staff appeared, despite being handcuffed and held at gunpoint.

She engaged the concierge in conversation and asked, "Are we gonna die?" He replied, saying: "I don't know".

According to the 35-year-old beauty, when the robbers left her apartment, they took the concierge with them and left him, still handcuffed, in the building lobby.

It was previously revealed officers suspect the raid was carried out by a "sophisticated international criminal organisation".

A source said: "We know the licence plate of one of the vehicles used, a Fiat 500, and a photograph of one of the suspects. They both appear to be French and highly professional.

"But this kind of robbery could only have been carried out by a sophisticated international criminal organisation.

"It would have to be if they had any hope of re-classify the stolen jewels and sell them again."

Kim's security guard Pascal Duvier has come under fire because he was out with her sisters Kendall Jenner and Kourtney Kardashian at the time of the incident, but he has vowed to track down the robbers.