Augusto Pinochet used an intricate web of more than 100 US bank accounts, including 63 with Citigroup , to hide and launder at least $15 million, a U.S. Senate report due out on Wednesday shows.

The Senate Permanent Subcommittee on Investigations found Pinochet’s use of the US financial system to cloak his financial dealings extended far beyond his accounts at Riggs Bank, which has admitted to failing to report suspicious transactions and paid a criminal fine.