NEW YORK —
The disclosure, in the bank’s annual securities filing, comes after Citigroup said its Mexican unit, Banamex, had been defrauded of as much as $400 million.
The subpoenas were issued by the US attorney’s office in Massachusetts.
Also, Banamex USA got a subpoena from the Federal Deposit Insurance Corporation related to the Bank Secrecy Act and anti-money-laundering program, Citigroup said.
The purported fraud stems from a $585 million accounts receivable program Banamex had offered to an oil supply company, Oceanografia, in Mexico. Invoices for work Oceanografia was supposed to have completed were falsified, according to Citigroup.
A person briefed on the matter said it was suspected that a Banamex employee was involved in the fraud.
Citigroup’s chief executive, Michael L. Corbat, said in a memo to employees that it was unclear how many people were involved.
The investigations indicate the purported fraud in Mexico could have larger legal ramifications for the bank, which has been trying to put many of its problems related to the financial crisis behind it.
The Securities and Exchange Commission and the FBI are also looking into the mater, people briefed on the matter said on Friday.
Citigroup said it was cooperating fully with all of the inquiries.