Petrobras shares plunge as Brazil's Lula swaps CEO, CFO
By Fabio Teixeira, Marta Nogueira and Rodrigo Viga Gaier RIO DE JANEIRO (Reuters) -Brazil's Petrobras announced the exit of its CEO and chief financial officer on Wednesday, and shares tumbled on news that a former regulator with views closer those of President Luiz Inacio Lula da Silva will take the helm the state-run oil firm.