Foul-smelling yellow snow that fell in western Siberia last week was caused by a cyclone bringing dust from Turkmenistan, local officials said Tuesday, AFP reported.

"According to data from the Russian meteorological services on January 28 and 29 a cyclone began to form in the southeast Caspian Sea above the territory of Turkmenistan, which moved across Turkmenistan, Uzbekistan, Kazakhstan and the Russian Volga and Ural regions," the website of the local government of Omsk said.