MOSCOW (AP) — Russian authorities on Tuesday confirmed reports of a spike in radioactivity in the air over the Ural Mountains while the suspected culprit, a nuclear fuel processing plant, denied it was the source of contamination. The Russian Meteorological Service said in a statement Tuesday that it recorded the release of Ruthenium-106 in the southern Urals in late September and classified it as "extremely high contamination." Russian authorities insisted, however, that the amount of Ruthenium posed no health risks.