Dozens of Russian cities have been shrouded in smoke as wildfires sweep across Siberia. Forest fires covering a huge area are being blamed on abnormally high temperatures and the neglect of fire-safety rules. Russia's Sakha Republic in northeastern Siberia, also known as Yakutia, has been the hardest hit. The Russian city of Yakutsk and 50 other Siberian towns and settlements have been covered by a thick haze from the flames.