Brasilia:
A 17-year-old youth, considered one of the most promising boxers in Brazil, has been shot dead by a police officer after an argument, officials said.
Tairone Silva was shot several times during an argument with a police officer in Porto Alegre, capital of Rio Grande do Sul state.
Silva's killing was a blow to the sport, the Brazilian Boxing Federation said.
"Brazil has lost an athlete of the future who dreamed of becoming a great boxer and competing in the 2016 Olympic Games" in Rio de Janeiro, the federation said in a statement.
Silva got into an argument Saturday with a police officer at a business in Porto Alegre, police said.
The officer fired at least four shots at him in front of several witnesses. The unidentified officer was arrested and taken to a police station.
Silva was Brazil's national champion in the 75-kg class for boxers in the 15-16 age group.