“The Brazilian government has begun deploying troops on the streets of Rio de Janeiro ahead of a major auction for oil exploration rights. Some 1,100 soldiers sealed off the seafront hotel, where the auction of the huge offshore Libra field is due to take place on Monday. President Dilma Rousseff ordered tighter security after violent demonstrations in Rio last week. Anti-government protesters have also threatened to march on the auction. In scenes similar to country-wide protests in June, petrol and gas bombs were thrown last Tuesday after marches in support of striking teachers.”
Source: BBC News – Brazil troops deployed ahead of Rio oil field auction