Kyiv Post reported the information.The Russian Telegram channel Mash reported the attack started around 3:55 a.m., with witnesses hearing three booms followed by a strong explosion. Eyewitnesses saw at least five drones flying at very low altitude.According to SHOT, between four and seven explosions occurred in the city. Shortly after, videos surfaced on various Telegram channels, reportedly showing a drone flying over the Arzamas Instrument-Making Plant (APZ).Early morning photos and videos showed a fire at the facility, but later images confirmed the fire had been extinguished.Note: The APZ produces instruments for aviation and space industries along with civilian products such as gyroscopic instruments, control systems, onboard computers, steering drives, verification systems, flowmeters, and medical equipment, according to Russian sources.On August 10, Russian authorities reported a drone attack on several regions, including the city of Saratov, where a fire broke out near an oil refinery.