Petrobras corruption scandal 'could change Brazil forever'
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The Brazilian oil giant Petrobras says it will improve its "internal policing" after being hit by a corruption scandal that's wiped billions off the value of the firm. Twenty-three people were arrested on Friday on suspicion of money laundering and graft involving the company. President Dilma Rousseff said the investigation could change the country forever. Also today: Toyota unveils its first emission-free car.