article_snippet.sent: CNN)Brazilian police have arrested the treasurer of the ruling Workers' Party, bringing the bribery investigation at the state-run oil company Petrobras a step closer to President Dilma Rousseff.
article_snippet.sent: Former executives who have turned state's evidence claim that construction companies paid large sums under the table to Petrobras officials and politicians in order to secure lucrative contracts with the state-run oil company Petrobras.
article_snippet.sent: Sources quoted in Brazilian media have said investigators are looking at whether some of the bribes went toward President Dilma Rousseff's election campaigns.