The U.S. government on Thursday filed a civil fraud lawsuit accusing UBS Group, Switzerland’s largest bank, of defrauding investors in its sale of residential mortgage-backed securities leading up to the 2008-2009 global financial crisis.

UBS was accused of misleading investors about the quality of more than $41 billion of subprime and other risky mortgage loans backing 40 securities offerings in 2006 and 2007, the Department of Justice said in a complaint filed with the federal court in Brooklyn.

The lawsuit came after UBS rejected a government proposal that it pay nearly $2 billion to settle, according to a person familiar with the talks who was not authorized to speak publicly about them.

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