WASHINGTON — JPMorgan Chase employed illegal "robo-signing" tactics to sue thousands of credit card borrowers behind on their debt, failed to provide adequate notice to customers facing debt collection litigation and committed various types of filing errors when bringing suits against consumers, California Attorney General Kamala Harris said in a lawsuit filed against the bank Thursday.

The suit, filed in California's Superior Court, essentially alleges the company automated its system for bringing debt collection practices against consumers in a manner designed to preempt their ability to defend themselves. Harris' complaint estimates the bank filed over 100,000 lawsuits submitted by in-house attorneys between January 2008 and April 2011 against consumers in the state. On April 1, 2010, for example, 469 suits were filed.

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