(Bloomberg) -- New York's top banking regulator is joining the U.S. Justice Department in investigating whether Credit Suisse Group helped U.S. clients evade taxes, a person with knowledge of the matter said.

Benjamin Lawsky, superintendent of New York’s Department of Financial Services, sent a demand for documents last month to Credit Suisse, the second-biggest Swiss bank, said the person, who asked not to be identified because the probe is confidential. Credit Suisse fell as much as 2.9 % in Swiss trading.

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