An investigation has been launched by environmental authorities in Russia after a river in Siberia turned blood red.

The Daldykan River lies near Norilsk, an industrial centre and one of the most polluted cities in Russia.

While a scientific reason for the change in water colour has yet to be pinpointed, many have blamed the phenomenon on waste from a nearby factory.

Metallurgical plants, owned by regional conglomerate Norilsk Nikel, have been cited by locals on social media as the probable source of the red dye.

Read more at The Independent.