More customers of Wells Fargo (WFC) - Get Report were impacted by the bank's sales scandal than previously thought, the U.S. bank stated in a regulatory filing on Wednesday. 

Wells Fargo had originally estimated the scandal to have impacted up to 2 million customers, however as part of an expanded review of the affected customers, there could be "an increase in the identified number of potentially impacted customers," Wells Fargo stated in a 10-K filing. 

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