This letter, dated September 5, 2003, from Acting Prosecutor General Yu.S. Biryukov to State Duma Deputy Sergei Kovalev, addresses the criminal investigation into the September 1999 apartment bombings in Moscow and Volgodonsk. The document confirms that the preliminary investigation regarding defendants A.O. Dekkushev and Yu.I. Krymshamkhalov has concluded, with charges including terrorism, illegal explosives operations, and murder. It specifically addresses and denies any procedural violations regarding the rights of victim I.N. Polyanskaya from Volgodonsk. Biryukov asserts that the investigation was conducted fully and objectively, concluding there are no grounds for further investigative actions. The letter serves as a formal rejection of concerns raised by Kovalev, who led an independent commission into the bombings.