The situation in the town of Sliven is very serious because of the silver frosts, Director of constrictions, ecology and management in emergency situation directorate Snezhana Kaneva informed Radio FOCUS-Sliven. The situation is serious and causes many difficulties. Two villages of Izgrev and Bozhevtsi in the region are still without electricity. It is expected power supper supply in the villages to be restored till the end of the day, Kaneva added.