People challenge the riot police as they block traffic during a protest against high electricity bills in Sofia February 17, 2013. Tens of thousands of Bulgarians protested in more than 20 cities against high electricity bills on Sunday, piling pressure on the government after a week of persistent demonstrations. REUTERS/Tsvetelina Belutova (BULGARIA - Tags: ENERGY POLITICS CIVIL UNREST) Published: Úno. 17, 2013, 4:56 odp. | Foto: Reuters