The U.K. police are being tight-lipped about the nation's largest jewelry heist. The BBC reports that two men have been arrested in connection with an August 6 robbery from Graff Jewelers in London. During the robbery, two men in disguises held up the store with hand guns and made off with $66 million in jewelry. They used a female hostage to exit the store, then sped off in a BMW before switching to a Mercedes and passing something to a man on a motorcycle. Forensic specialists have been examining the cars, the motorbike, a discarded handgun, and the makeup materials used to change the their appearance. Although the Metropolitan Police confirmed the arrests, they gave no further details for "operational reasons."