Citigroup Inc. (C), the third-biggest U.S. bank by assets, received requests for information from the Monetary Authority of Singapore related to probes into the rigging of key benchmarks used to set loan rates.

“Certain Citigroup subsidiaries have received additional requests for information and documents from various domestic and overseas regulators and enforcement agencies, including the Monetary Authority of Singapore and a consortium of state Attorneys General,” the New York-based company said today in a regulatory filing.

Citigroup said it continues to cooperate with all of the investigations. Mark Costiglio, a spokesman for New York-based Citigroup, declined to comment on the Singapore request.

Regulators worldwide are probing lenders about their roles in setting the London interbank offered rate, or Libor, the most widely used benchmark for interest rates. Citigroup previously disclosed that it received requests for information from government agencies in the U.S., including the New York and Connecticut attorneys general.

Royal Bank of Scotland Group Plc, Britain’s biggest taxpayer-owned lender, said last week it expects to pay a fine in coming months to settle Libor probes. Barclays Plc paid a 290 million pounds ($463 million) fine in June.

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