U.S. authorities have joined Brazil’s investigation into alleged bribery involving Petrobras and some of the world’s largest trading companies, according to the Brazilian law enforcement officer in charge of the probe. The U.S. Justice Department and Federal Bureau of Investigation have also started working on the investigation, first announced by Brazilian authorities in December, that includes trading companies Trafigura Group Ltd., Vitol Group and Glencore Plc, said Filipe Pace, head of the so-called Carwash probe. The Justice Department declined to comment Thursday. Brazilian prosecutors have accused at least ... (full story)