Earlier in the day, the FSB reported that Nemtsov, who was shot dead in central Moscow in February 2015, was killed with a homemade firearm assembled using imported parts.
"Anyway, the origin of the handgun will not have any impact on the common version of the investigation. I am sure that the majority of the detained are implicated in the crime, and Zaur Dadayev is a shooter, who had a service gun, but he shot not with it," Vadim Prokhorov told RIA Novosti.
Five persons were detained on suspicion of involvement in the murder — Dadayev, Hamzat Bakhayev, Tamerlan Eskerkhanov, Shadid and Anzor Gubashev. The alleged mastermind of the murder, Ruslan Mukhudinov, has been arrested in absentia.