By Max Colchester 

LONDON--Rate rigging has a new victim: the Bank of England.

On Monday, Lloyds Banking Group PLC said its traders rigged a benchmark interest rate to cut fees it paid the central bank to access emergency taxpayer funding at the height of the financial crisis.

The admission of wrongdoing was part of a wider $370 million settlement the British bank made with U.S. and U.K. authorities for attempting to manipulate a series of benchmark interest rates, including the London interbank offered rate, or Libor.

In the latest twist to the rate-rigging scandal, the U.K.'s Financial Conduct Authority said Lloyds's traders also manipulated the BBA repo rate. The now-defunct benchmark helped determine the fees that Lloyds and other banks paid to the Bank of England during the crisis to swap toxic assets, such as mortgage-backed securities, for U.K. government bonds. Those bonds could then be traded for cash, helping shore up the banks. The program was in effect in 2008 and 2009.

Lloyds, which is 25% government owned, said it has reimbursed the Bank of England nearly GBP8 million ($13.6 million) to make up for the fees it avoided paying to the taxpayer-backed program. The Bank of England will pass the cash to the U.K. Treasury, making it one of the first institutions to be compensated for the effects of rate rigging.

"Such manipulation is highly reprehensible, clearly unlawful and may amount to criminal conduct on the part of the individuals involved," Bank of England Gov. Mark Carney wrote in a July 15 letter to Lloyds's chairman, posted on the central bank's website Monday.

Lloyds apologized for its behavior on Monday and said the rigging of the BBA repo rate was restricted to four individuals. The bank has suspended all four traders, according to a person familiar with the matter.

The wider rate-rigging misconduct at Lloyds wasn't confined to low-level employees. "Sixteen individuals at the firms, seven of whom were managers, were directly involved in, or aware of, the various forms of Libor manipulation," the FCA said.

Lloyds said it "condemns the actions of the individuals responsible for the conduct in question." On Monday, Lloyds's shares edged up 0.04%, to 74.84 pence.

Lloyds Banking Group was by far the biggest user of the program to access crisis-era funding, paying GBP1.28 billion in fees to the Bank of England. In 2008 and 2009, U.K. banks paid a total of GBP2.6 billion to access the facility, according to the FCA. Those fees were in turn handed over to the U.K. Treasury.

Andrew Tyrie, chairman of the U.K.'s Treasury Committee, called the rigging of the repo rate "appalling behavior."

Lloyds's misconduct took place before the bank's existing management team took over in 2011. Nevertheless, the fine is a setback to the bank's attempt to rehabilitate its reputation after taxpayer bailouts in 2008 and 2009. Lloyds is considering clawing back the pay of former executives who were involved in the attempted rate manipulation, according to one person familiar with the matter.

The bank is the seventh financial institution to strike a deal with U.S. and U.K. authorities in a long-running probe into allegations of widespread attempts to manipulate Libor and other widely used interest-rate benchmarks.

Libor is used in setting rates on $800 trillion of loans and securities and is based on daily estimates by banks about how much it would cost them to borrow from other banks.

The U.S. Justice Department, the Commodity Futures Trading Commission and the U.K.'s Financial Conduct Authority said employees of Lloyds tried to manipulate benchmark rates to benefit the bank's financial position.

As well as trying to rig the U.S. dollar Libor rate, the FCA said Lloyds colluded with Rabobank NV to influence the Japanese yen Libor rate. Rabobank settled Libor-rigging charges last year and admitted wrongdoing. HBOS, a unit of Lloyds, tried to lowball its Libor submissions to give the appearance that it was financially sound around the time it was being acquired by Lloyds in 2008, according to the CFTC.

Lloyds executives have argued that their involvement in rate rigging was relatively minor compared with other U.K. banks. Barclays PLC, which was the first bank to settle a rate-rigging probe in 2012, paid GBP290 million in fines. In 2013, Royal Bank of Scotland Group PLC paid GBP390 million to settle similar allegations. Both banks admitted wrongdoing.

Write to Max Colchester at max.colchester@wsj.com

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