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U.S. prosecutors in New York sued Bank of America on Wednesday, accusing it of carrying out a mortgage scheme that defrauded the government during the depths of the financial crisis.

In a civil complaint that seeks to collect $1 billion from the bank, the Justice Department took aim at a home loan program known as the "hustle," a venture that has become emblematic of the risk-fueled mortgage bubble. The complaint adds to a flurry of federal and private lawsuits facing Bank of America's beleaguered mortgage business.

Bank of America inherited the "hustle" home loan program with its purchase of Countrywide Financial in 2008. Prosecutors say the effort, kept alive by Bank of America through 2009, was intended to churn out mortgages at a rapid pace without proper checks on wrongdoing. The bank then sold the "defective" loans without warning to Fannie Mae and Freddie Mac, the government-controlled housing giants, which were stuck with heavy losses and a glut of foreclosed properties.

Countrywide was a significant lender in Utah during the period covered by the lawsuit. In 2010, the state of Utah entered into a settlement with Bank of America in which it agreed to modify its lending practices and offer loan modifications to homeowners who were victims of shoddy or predatory lending practices.

"The fraudulent conduct alleged in today's complaint was spectacularly brazen in scope," Preet Bharara, the U.S. attorney in Manhattan, said in a statement.

Bharara brought the case with the inspector general of the Federal Housing Finance Agency, which oversees Fannie Mae and Freddie Mac, and the government watchdog for the bank bailout program.

Bank of America spokesman Lawrence Grayson told The Associated Press the bank "has stepped up and acted responsibly to resolve legacy mortgage matters." He called the allegation that the bank has failed to buy back loans "simply false."

"At some point," Grayson said, "Bank of America can't be expected to compensate every entity that claims losses that actually were caused by the economic downturn."

Countrywide was a giant in mortgage lending, but was also known for approving exotic, even risky, loans. By 2007, as the market for subprime mortgages collapsed, Countrywide was eager for revenue. The case is one piece of a broader federal crackdown on Wall Street, a last-ditch effort to hold firms accountable for perceived misdeeds that fueled the mortgage crisis. In the wake of the crisis, authorities were blamed for the dearth of charges facing financial executives at the center of the crisis.

For all the grumbling about few criminal prosecutions, the government has now mounted dozens of civil cases against the nation's biggest financial firms, leaving the financial industry to battle a chaotic and somewhat redundant web of litigation. Bharara sued Wells Fargo this month over questionable mortgage deals. President Barack Obama also formed a federal mortgage task force, which recently filed its first case against JPMorgan Chase over mortgage deals created by Bear Stearns, the defunct firm that JPMorgan bought during the crisis.

The case announced Wednesday is the latest legal headache for Bank of America stemming from its acquisition spree during the crisis. The bank, which has come to define the excesses that nearly toppled the financial industry in 2008, struck a $2.4 billion deal in September to settle a securities class-action lawsuit that it misled investors about the takeover of Merrill Lynch.

The Countrywide deal has fared far worse. Billions of dollars in soured loans from the subprime lending specialist wreaked havoc on Bank of American's balance sheet. Securities regulators have also extracted nearly $70 million in fines from Countrywide's former chief executive, Angelo R. Mozilo.

The lawsuit filed Wednesday threatens to impose steep fines on the bank. The Justice Department filed the case under the False Claims Act, which could provide for triple the damages suffered by Fannie and Freddie, a penalty that could reach more than $3 billion.

The case also overlaps with a number of actions that government agencies are pursuing against Wall Street banks. It builds on, for example, the Federal Housing Finance Agency's decision last year to sue 17 big banks over losses sustained by Fannie Mae and Freddie Mac. The twin mortgage companies, bailed out by taxpayers in 2008, continue to push firms like Bank of America to repurchase billions of dollars in bad loans.

The Salt Lake Tribune contributed to this story