Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Radiation Monitoring Stations Offline After Mysterious Russian Blast VOA News Four radiation monitoring stations in Russia have gone offline after a mysterious blast at a Russian missile testing facility on Aug. 8, according to the Comprehensive Nuclear-Test-Ban Treaty Organization. CTBTO, an independent group that operates an international network of radiation monitoring stations, said two Russian stations closest to the blast site went offline two days after the unexplained explosion and reports of radiation spikes. Two other stations went silent on Aug. 13. It is not clear what caused the outage or whether the stations were tampered with by Russia. Russian officials told the CTBTO they were having "communication and network issues," a spokeswoman for the organization said Monday. Russia's state nuclear agency has acknowledged that five nuclear workers were killed in the explosion, which occurred during a rocket engine test near the White Sea in far northern Russia. .