The U.K. financial markets regulator is investigating certain units of Royal Bank of Scotland Group PLC over compliance with money laundering regulations, the bank disclosed in a prospectus to shareholders.

According to the prospectus, RBS was informed about the Financial Services Authority probe into "certain aspects of the policies of, and training and controls within" some U.K. units in November.

The investigation concerns the period between December 2007 and December 2008, RBS added.

An RBS spokesman said the group and its units "are cooperating fully with the investigation."

The FSA was not immediately available to comment.

RBS has a large U.S. presence. It is the parent company of Citizens Financial Group, a $153 billion-asset holding company for subsidiaries that run 1,480 branches in 12 states under the Citizens Bank and Charter One brands.

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