UPDATE 1-Brazil's Petrobras vows to investigate graft allegations
November 17, 2014 at 09:01 AM EST
RIO DE JANEIRO, Nov 17 (Reuters) - Brazil's state-run oil company Petroleo Brasileiro SA vowed on Monday to fully investigate a money-laundering scandal that has rattled the company's shares and caused the biggest crisis to date for President Dilma Rousseff's government.