Part of the investigation is looking into Citigroup's anti-money laundering policies and systems to prevent financial crimes, the report said.

An investigation focuses on services provided by the bank for a trust that held the sanctioned billionaire’s assets.

Citigroup (NYSE:C) is under investigation by the Department of Justice, the Federal Bureau of Investigation, and the Internal Revenue Service for its alleged involvement with a trust that holds assets tied to Suleiman Abusaidovich Kerimov,

Citigroup is being probed by U.S. government agencies over its ties to sanctioned Russian billionaire Suleiman Abusaidovich Kerimov, Barron's reported on Thursday, citing a person familiar with the matter.

Citigroup Inc. is being investigated by US government agencies over its ties to a sanctioned Russian official, according to a person familiar with the matter.

US government agencies are investigating Citigroup Inc. over its links to sanctioned Russian oligarch Suleiman Kerimov, Bloomberg reports. The investigation led by the Department of Justice, the FBI,