California Attorney General Kamala Harris ordered the third-largest US bank by assets to provide a trove of information, including the identities of the California customers who had unauthorized accounts opened in their names and those of the Wells Fargo employees who opened them, the newspaper said, citing a search warrant served October 5.
Harris wants to know whether Wells Fargo violated California laws prohibiting certain types of impersonation and the unauthorized use of personal information, according to the newspaper.
Confirming it had received a request for information, a Wells Fargo spokesman told AFP: "We are cooperating in providing the requested information."
Representatives of Harris did not immediately respond to requests for comment.
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Wells Fargo, whose biggest shareholder is billionaire Warren Buffett, has been reeling since US and California regulators disclosed in September some two million deposit and credit card accounts were opened in customers' names between 2011 and 2016 without their approval.
The scandal led to the resignation of chairman and chief executive John Stumpf last week. He was succeeded as CEO by president and chief operating officer Tim Sloan, a 29-year company veteran, who promised transparency and tighter oversight.
An internal Wells Fargo inquiry is also underway.
The San Francisco-based bank is under investigation by the Justice and Labor departments and could face lawsuits from shareholders and customers.
Some US states, including California and Illinois, have cut ties with the bank.