"The loss amounts to several million euros, mostly jewellery. The total amount is still being evaluated," police said.
On Monday, Kardashian West was pictured leaving from Le Bourget airport on the outskirts of the French capital after undergoing police questioning.
Dressed in black with a hood covering her face, she boarded a private jet with security guard Pascal Duvier and her personal assistant.
'WORST MOMENT OF MY LIFE'
Kardashian West, 35, is believed to have pleaded with attackers for her life, saying it was the "worst moment of my life" and she had "babies at home", according to TMZ.
A spokesman for France's Interior Ministry told CNN the building concierge was threatened, handcuffed and forced to open the luxury apartment where Kardashian West was staying.
She is believed to have been forced into the bathtub while the masked men robbed phones and jewels worth millions before escaping on bikes.
Spokeswoman Ina Treciokas said: "Kim Kardashian West was held up at gunpoint inside her Paris hotel room this evening, by two armed masked men dressed as police officers. She is badly shaken but physically unharmed."
Kardashian West's half-sister Kendall Jenner and a friend, Jasmine Sanders, were seen leaving the apartment under police protection. Police were also pictured removing bags of evidence.
A photographer who has been trailing Kardashian West all week and gained access to a restaurant using police disguise is reportedly being questioned by police.
A source close to the case told The Sun the victims were "unharmed but they are clearly in a state of shock and fear".
ATTACKED IN LUXURY RESIDENCE
The attack happened in a discreet luxury residence, the Hotel Pourtalès, in the 8th arrondissement used by celebrities and wealthy individuals behind the French capital's Madeleine church.
The building with nine separate flats contains wooden floors with soaring ceilings and luxury furnishings. Police were guarding the site on Monday and had placed the family members still in Paris under protection.
Kardashian has stayed there at least once before, in 2014, before her marriage to rapper Kanye West.
A waiter at a cafe opposite told AFP the apartment is only used by stars and it was common to see people coming and going with crowds of photographers outside.
"Kanye West, Jay Z. Kim Kardashian has been there for a week, I have seen her coming and going," he said. Madonna and Prince are also reported to have been guests there.
Social media-savvy Kardashian's latest activity was via her Snapchat account, with several short videos posted in the hours leading up to the incident.
In one video Kim is seen FaceTiming her brother Rob's partner Blac Chyna, while in another, a friend plays up to the camera.
Former Met Police Detective Peter Kirkham told The Mirror her conspicuous social media presence was like "leaving her window open" for burglars. Now a security consultant, he said the valuable pieces were most likely "broken up" to avoid being recognised.
FRIENDS AND FANS SPRING TO DEFENCE
Friends and fans of the celebrity have come to her defence on Twitter, slamming trolls who have suggested the robbery may have been a publicity stunt or there were other, worse things happening in the world.
James Corden, Piers Morgan and Chrissy Teigen have all come out in her defence with Teigen saying fame is "interesting" for the way "celebs are supposed to love you guys while also knowing you'd make a meme of our dead bodies to get retweets."
"Please do not think that I think celebrities are special snowflakes. I just miss empathy, in general, for everyone," she said.
