(Bloomberg) -- New York’s top banking regulator sent a subpoena to Credit Suisse Group AG last week as he examines whether its private bank helped clients evade state taxes, a person with knowledge of the matter said.

Benjamin Lawsky, the superintendent of New York’s Department of Financial Services, sought records from the firm’s New York operations, including e-mails, travel records, calendars, payroll information and material on hard drives, according to the person. He also is seeking information on Roger Schaerer, a former top manager at the New York office, and on executives who worked with Schaerer, the person said, asking not to be identified because the probe is confidential.

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