Russia probes smelly orange snow

Russia has flown a team of chemical experts to a Siberian region to find out why smelly, coloured snow has been falling over several towns.

Oily yellow and orange snowflakes fell over an area of more than 1,500sq km (570sq miles) in the Omsk region on Wednesday, Russian officials said.

Chemical tests were under way to determine the cause, they said.

Residents have been advised not to use the snow for household tasks or let animals graze on it.