The suspected thieves were busted during sweeping raids early Monday in Paris, Rouen and Grasse but have not been formally charged in the Oct. 3 robbery, according to Europe 1.
Reports by Europe 1 and RTL Radio said the arrests were made in part thanks to DNA traces left behind. The suspects can be held for at least 96 hours.
In New York, Kardashian is expected to identify the suspects in a lineup presented through a video feed.
Mask-wearing men barged into Kardashian’s private room demanding $5.6 million worth of jewelry, including the famed diamond ring Kanye West gave to Kardashian.
She was tied up, gagged and thrown into a bathtub as the men rifled through her room.