(Bloomberg) -- UBS Group AG was hit with a long-expected fraud lawsuit by the U.S. accusing the Swiss bank of fueling the 2008 financial crisis by deceiving investors who bought tens of billions of dollars of risky mortgage-backed securities.

UBS and its units securitized more than $41 billion of mortgage loans in deals that proved to be "catastrophic failures," U.S. Attorney Richard Donoghue in Brooklyn, New York, said in a statement. The bank deprived investors of critical information and knowingly put them at risk of harm in products employees privately derided, with one comparing them to “leprosy spores,” according to the 302-page complaint filed Thursday.

The case comes two years after Deutsche Bank AG and Credit Suisse Group AG agreed to pay a combined $12.5 billion over allegations by the Justice Department that they peddled toxic mortgage debt.

It’s one of two large outstanding cases against UBS. Prosecutors in France accuse Swiss UBS bankers of providing numbered accounts for French clients and setting up trusts to launder money customers hadn’t told tax authorities about.

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“The DOJ’s claims are not supported by the facts or the law,” the Zurich-based bank said Wednesday, before the complaint was filed. “UBS will contest any such complaint vigorously in the interest of its shareholders. UBS is confident in its legal position and has been fully prepared for some time to defend itself in court.” The bank also denies any wrongdoing in the French tax case.

Fighting the residential mortgage-backed securities case in court is a risk that could pay off for UBS, though could also result in a higher fine. Barclays Plc fought back against the DOJ in a similar case two years ago, when negotiations broke down over the size of the penalty involved. Federal prosecutors in Brooklyn filed a civil complaint against the bank, but ultimately settled the case earlier this year for $2 billion, less than half of what U.S. authorities had originally demanded.

From 2006 through 2007, UBS misled investors about the quality of billions of dollars in subprime "Alt-A" mortgage loans backing 40 RMBS deals. In publicly filed documents, UBS "knowingly misrepresented key characteristics of the loans," according to the U.S., which were much riskier and more likely to default than UBS represented to investors. Eventually, the 40 residential mortgage-backed securities suffered "serious" losses, according to the government.

In internal communications, UBS employees made their views on originators’ practices clear, according to U.S. prosecutors. In one instance, a UBS trader concluded a month before selling certificates to investors that the loans were "quite possibly better than little beside leprosy spores."

UBS representatives didn’t respond after regular business hours on Thursday to a request for comment.

Thursday’s case was jointly brought by prosecutors in Brooklyn and Atlanta.

“UBS allegedly placed a higher priority on selling bonds and making profits than accurately representing the quality of the underlying loans to investors,” said U.S. Attorney Byung Pak in Atlanta. “These practices resulted in massive losses to investors, harmed homeowners, and ultimately jeopardized the banking system."

UBS already has paid hundreds of millions to resolve RMBS probes by the state of New York and the National Credit Union Administration, which blamed the bank for contributing to the collapse of corporate credit unions.

Bank of America Corp.’s Countrywide unit was the first lender to be found at fault at trial by a federal jury for selling defective mortgage loans under a decades-old statute enacted during the savings-and-loans crisis -- the same law cited in the UBS complaint. But in 2016, Bank of America persuaded an appeals court to throw out a judgment of almost $1.3 billion.

The case is U.S. v. UBS AG, 18-cv-6369, U.S. District Court, Eastern District of New York (Brooklyn).

--With assistance from Greg Farrell.

To contact the reporter on this story: Patricia Hurtado in Brooklyn federal court at pathurtado@bloomberg.net

To contact the editors responsible for this story: David Glovin at dglovin@bloomberg.net, Peter Blumberg, David Scheer

©2018 Bloomberg L.P.

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