Both French and German nuclear surveyor institutions belatedly reported of a radioactive cloud over central-west Europe with apparent origin in West Siberia (Russia). The presence of ruthenium-106 strongly suggests a nuclear meltdown at some site, accident that has been hidden from the public.
|The radioactive cloud seems to have its peak over Sverdlovsk Oblast (Russia)|
The cloud was detected between the September 29th and October 13th but has been reported to the public only now.
As far as I can tell the most likely candidate for the accident is not the Mayak complex in Cheylabinsk Oblast, as suggested by the article linked above, but the Beloyarsk Nuclear Power Station in Sverdlovsk Oblast.