Police arrested three men on Thursday, including an employee of the Bul Shiruki arms factory, on suspicion of operating a black market of firearms that supplied guns to the criminal world. According to the police's National Serious and International Crimes (NSIC) Unit, the employee stole gun parts from his Tel Aviv factory before they were stamped with serial numbers, and assembled them into hundreds of functioning firearms, selling them to a security guard. The guard, in turn, transferred the weapons to a taxi driver, who acted as a black market firearms vendor for criminal clients. Police first became suspicious about the origins of guns being used by criminals in May, when a CSI team working at the police's national headquarters in Jerusalem received Bul-manufactured handguns lacking any serial numbers. A joint NSIC-Lahav 433 anti-organized-crime unit investigation was launched, tracing the guns to a 41-year-old Bul employee responsible for painting gun parts. "He systematically stole the parts before they were marked with a serial number, assembled them, and sold them on," a police statement said. The three suspects made thousands of shekels in profits, police added. Police stressed that the owners of Bul had been completely unaware of the employee's activities.