Description of . A bus with Bulgarian police is parked outside the office of Czech power group CEZ in Sofia February 19, 2013. Bulgaria\'s Prime Minister Boiko Borisov sought to calm mass protests on Tuesday by promising to slash electricity prices and punish foreign-owned power companies, setting Bulgaria on a collision course with EU partner the Czech Republic. Borisov said the distribution license of central Europe\'s largest listed company, Czech-based CEZ would be revoked.   REUTERS/Stoyan Nenov
{}