Jan 31 (Reuters) - A top U.S. bank regulator on Wednesday imposed a $65 million fine on Royal Bank of Canada's American unit, City National Bank, over gaps in the lender's risk management and internal controls.

The Office of the Comptroller of the Currency (OCC) said that the bank engaged in unsafe or unsound practices, including failure to establish effective risk management and internal controls.

The OCC issued a cease-and-desist order requiring the bank to take broad and comprehensive corrective actions to improve its strategic plan, the agency said in a statement.

City National did not immediately respond to a Reuters request for comment.

In October last year, City National disclosed that RBC has injected about $2.95 billion into its U.S. unit to bolster its capital. The capital injections came as a part of management actions to improve profitability at City National.

RBC has previously said realized losses at City National would be eliminated at the RBC consolidated level.

(Reporting by Gursimran Kaur in Bengaluru; Editing by Rashmi Aich)