The Securities and Exchange Commission (SEC) has accused Wells Fargo of failing to produce documents relating to an investigation of the bank's mortgage-backed securities.The SEC filed a subpoena enforcement action in federal court on Friday, seeking to force Wells to comply with subpoenas dating back to September 2011.

Regulators have been investigating Wells Fargo's disclosures about the mortgages that it securitized and sold to investors between September 2006 and early 2008. The probe involves almost $60 billion worth of residential mortgage-backed securities that Wells sold to investors.

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