By Christina Rexrode And Emily Glazer 

Citigroup Inc. said Wednesday that the Treasury Department and California regulators are looking into its Banamex USA unit.

The Treasury and regulators have asked for information related to the bank's compliance with anti-money-laundering rules, according to Citigroup's annual report. The inquiries came from the Financial Crimes Enforcement Network, known as FinCEN, which is part of the Treasury Department, and the California Department of Business Oversight.

The disclosure came on a day when financial-services companies including Morgan Stanley, Wells Fargo & Co., Discover Financial Services and BB&T Corp. released their annual SHYreports.

Last year, Citigroup said the Banamex USA unit had received grand-jury subpoenas from the U.S. attorney's office of Massachusetts and a subpoena from the Federal Deposit Insurance Corp., both related to the unit's compliance with rules meant to prevent money laundering.

Citigroup didn't give any update on those investigations, but it did say it is "cooperating fully" with the inquiries.

Banamex USA is a deposit-taking bank based in California, which serves customers who need to move money across the U.S.-Mexico border. Citigroup inherited the operation when it bought Banamex, a large Mexican bank, in 2001.

The disclosure is the latest headache stemming from Citigroup's Mexico-related activities and is part of a broader focus by U.S. regulators on money-laundering issues globally.

The FDIC and the California regulators previously filed a consent order against Banamex USA in 2012, telling the bank to create better processes for identifying high-risk customers, among other changes. The bank agreed to make the changes but didn't admit or deny wrongdoing and didn't pay a fine.

Separately, Wells Fargo updated investors on its long-running legal tussle with the Federal Housing Administration, suggesting the matter may take longer to resolve after settlement discussions fell apart.

The San Francisco-based bank, which has been in litigation with the FHA since 2012, said in its annual report that the "previous resolution discussions" with the FHA "did not result in an acceptable final agreement" and that the bank is "again engaged in discovery."

Wells Fargo had been in talks with the U.S. attorney in the Southern District of New York and the Justice Department for months over allegations it improperly certified certain FHA mortgage loans for U.S. Department of Housing and Urban Development insurance that didn't qualify for the program.

The government alleges Wells Fargo shouldn't have received insurance proceeds from HUD when some of the loans later defaulted.

It also alleges the bank may have known that some of the mortgages didn't qualify for the insurance to begin with, and that Wells Fargo didn't disclose those deficiencies to HUD before making the insurance claims. Wells Fargo has appealed parts of the lawsuits in court but so far has been denied. The bank has declined to comment further on the case.

The discussions almost came to a resolution late this past summer when the bank was in negotiations with the U.S. attorney's office on a settlement for under $500 million, people familiar with the matter said.

But several months ago, the Justice Department asked the bank for additional evidence, the people added.

Write to Christina Rexrode at christina.rexrode@wsj.com and Emily Glazer at emily.glazer@wsj.com

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