Packets of U.S. American dollars notes in plastic bags in the trunk of a car are seen in this handout picture in Buenos Aires, ArgentinaBy Hugh Bronstein BUENOS AIRES (Reuters) – A top public works official in Argentina's previous government was arrested on Tuesday while throwing what police called "an obscene amount of cash" over the walls of a monastery, intensifying questions about possible past corruption. Within minutes, officials said, former Deputy Public Works Minister Jose Lopez was in custody, where he remained on suspicion of money laundering. "Lopez managed everything that had to do with public works under the previous government.