FRANKFURT, Germany (AP) — German media report that Deutsche Bank AG has put at least five of its traders on indefinite leave as part of an effort to restore the company's ethical credibility.

Daily Sueddeutsche Zeitung reports that the unnamed employees were involved in a lucrative "tax carousel" trading system for carbon emissions credits.

A tax carousel refers to a scheme where dozens of companies are used by traders to confuse tax authorities and thereby earn money.

Deutsche Bank declined to comment on the report Thursday, citing ongoing legal proceedings.

Germany's biggest bank had long denied wrongdoing until a German court case this year brought to light questionable business practices at Deutsche Bank.

Co-CEOs Juergen Fitschen and Anshu Jain announced they wouldn't tolerate unethical behavior when they replaced Josef Ackermann earlier this year.

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  • JPMorgan Chase Loses $2 Billion

    On May 10th, the U.S.'s largest bank JPMorgan Chase announced one of its London trading desks had lost <a href="http://www.huffingtonpost.com/2012/05/10/jpmorgan-chase-london-whale_n_1507662.html?ref=business" target="_hplink">$2 billion on bad bets on credit derivatives</a>.

  • UBS Trader Loses $2 Billion

    Kweku Adoboli, a trader for Swiss bank UBS, lost <a href="http://www.huffingtonpost.com/2011/09/15/ubs-traders_n_963715.html" target="_hplink">$2 billion on unauthorized trades in September 2011</a>.

  • MF Global Collapse

    Brokerage firm <a href="http://www.huffingtonpost.com/2011/10/31/mf-global-to-file-for-bankruptcy_n_1066902.html" target="_hplink">MF Global filed for Chapter 11 bankruptcy</a> in October 2011 after a failed $6 billion bet on European debt.

  • Rogue Societe General Trader Loses $6 Billion

    Hailed as "history's biggest rogue trading scandal" at the time, French trader Jerome Kerviel was convicted in October 2010 of <a href="http://www.huffingtonpost.com/2010/10/05/jerome-kerviel-rogue-fren_n_750464.html" target="_hplink">losing French bank Societe General around $6 billion</a> due to unauthorized trades.

  • Bear Sterns Bought By JPMorgan Chase

    After a run on investment bank Bear Sterns nearly caused its collapse in 2007, JPMorgan bought the firm for $2 a share the following March, <a href="http://www.businessweek.com/bwdaily/dnflash/content/mar2008/db20080316_356646.htm" target="_hplink">Businessweek</a> reports.

  • AIG Largest Single Bailout

    Insurance company AIG became the recipient of the <a href="http://www.huffingtonpost.com/2012/05/08/aig-bailout-realize-15-billion-profit-taxpaers-gao_n_1498645.html" target="_hplink">largest ever government bailout for a single corporation</a> when a $182 billion rescue package saved it from a liquidity crisis following a <a href="http://www.huffingtonpost.com/2012/05/08/aig-bailout-realize-15-billion-profit-taxpaers-gao_n_1498645.html" target="_hplink">downgrade of its credit rating</a> in 2008.

  • Washington Mutual Bankruptcy

    One of the biggest players in retail banking and mortgages during the housing crisis, Washington Mutual filed for Chapter 11 in September 2008, after sustaining losses on billions of dollars worth of mortgage and home loans, <a href="http://www.cnbc.com/id/46793926/WaMu_Emerges_From_Bankruptcy_Protection" target="_hplink">CNBC</a> reports.

  • Citigroup Bailout

    Citigroup came to the brink of collapse after it reported losses around $10 billion in 2007, in part due to failed mortgage investments, <a href="http://money.cnn.com/2008/01/15/news/companies/citigroup_earnings/index.htm" target="_hplink">CNNMoney</a> reported. To keep the bank afloat the government issued <a href="http://www.huffingtonpost.com/2008/11/23/feds-consider-plan-to-res_n_145856.html" target="_hplink">a $20 billion bailout in November of that year</a>.

  • Merill Lynch Shocks Investors With Big Loss

    After projecting a $4.5 billion loss during the third quarter of 2007, Merrill Lynch shocked investors by reporting a $7.9 billion deficit from trading mortgage-backed securities and other structured products, <a href="http://money.cnn.com/magazines/fortune/fortune_archive/2007/11/26/101232838/" target="_hplink">according to CNNMoney</a>.

  • Barings Bank Collapse

    One time star trader Nick Leeson was responsible for sinking British bank Barings after losing $1 billion when an an earthquake struck Kobe, Japan in 1995, causing his investments in the Nikkei to fail as the Japanese stock exchange crashed, <a href="http://www.time.com/time/specials/packages/article/0,28804,1937349_1937350_1937488,00.html" target="_hplink">TIME reported</a>.