Description:Peruvian police clash with protesters opposed to a U.S. company's plans for a 5 billion U.S. dollar gold mine. Three were killed and 21 injured in the first bout of violence since the protests started in the northern town of Cajamarca late last year. Peruvian Prime Minister Oscar Valdes spoke on Tuesday, condemning the violence and calling for dialogue. Newmont Mining's mine would be the biggest built in Peruvian history. (0:59)