Colored snow falls in Russia

The Beeb reports:

Oily yellow and orange snowflakes fell over an area of more than 1,500sq km (570sq miles) in the Omsk region [on January 31st], Russian officials said ... "So far we cannot explain the snow, which is oily to the touch and has a pronounced rotten smell," said Omsk environmental prosecutor Anton German, quoted by the Russian news agency Itar-Tass ... Vladimir Gurzhey, an official with the civil defence ministry in Omsk, told the Russia TV channel that the snow had four times the normal levels of iron in it.

Yahoo! follows with:

"Yellow snow that fell on Omsk region ... poses no threat to people's health," Vladimir Gurzhei, a regional emergency official, told Interfax news agency ... Russia's weather watchdog said it may have been caused by a rare dust hurricane in neighboring Kazakhstan. Alexei Yablokov of the Russian Academy of Science told Ekho Mosvky radio station it may have been polluted by a chemical accident in Siberia.