LONDON—Former trader Tom Hayes told British investigators he was "not concerned" when the London interbank offered rate, or Libor, came under scrutiny from media and regulators in 2008; because his employer had never questioned his trading activities, a London court heard Tuesday.

Mr. Hayes, a former UBS AG and Citigroup Inc. trader, is on trial for conspiring to defraud through attempted benchmark interest rate rigging. In an interview with the investigators in May 2013 he said he didn't understand why there was "all this cloak-and-dagger stuff" from authorities about his actions, when emails showed that UBS paid a brokerage firm to provide him with a "Libor service" and his manager knew Mr. Hayes had made an agreement with a trader at another bank on rate submissions.

A UBS spokeswoman declined to comment.

The interviews were read out and emails were shown to a jury hearing the trial of Mr. Hayes, who is charged with eight counts of fraud related to alleged manipulation of Libor. Mr. Hayes, who has pleaded not guilty, is accused of working with brokers in a conspiracy to manipulate benchmark interest rates to benefit his holdings of derivatives. Lawyers for Mr. Hayes say that multiple banks and traders were engaged in similar activities to manipulate Libor and other benchmark rates that are set daily by panels of banks based on their anticipated borrowing costs.

Mr. Hayes said he thought his contacts at the brokerage firm providing the "Libor service" were being "paranoid" when they asked him in January 2008 to start using coded language and tone down requests to them to help influence global interest rate benchmarks. He said he hadn't seen any red flags raised over Libor setting by his colleagues or counterparts at other banks, and so didn't take the brokers' concerns seriously.

When it became known months later that authorities were probing Libor rates and the submission process, following an April 2008 article in The Wall Street Journal questioning the integrity of the rates, Mr. Hayes said he thought any investigation would only relate to "low balling" by banks in the financial crisis to make themselves appear healthier.

He told the investigators that banks had submitted low Libor rates in the crisis that were "100% wrong" in contrast to his own "mucking around" on the margins of Libor rates. "I honestly didn't think that the rates that we were submitting were outside of where cash was trading," Mr. Hayes said in the interview.

The jury was shown emails and chats between brokers and Mr. Hayes that suggested traders at other banks requested moves in Libor rates to benefit their trading books.

"I wasn't the only one around the world who did all this stuff, you know, it was really common practice in the industry," Mr. Hayes said in the interview read out in court.

The jury also heard that the former UBS and Citigroup trader accepted a £ 1,000 ($1,571) dinner from a broker in late 2009, just before Mr. Hayes was due to start a new job at Citigroup Inc. In an email to the broker, Mr. Hayes said he would soon send some business the broker's way in return.

Write to Margot Patrick at margot.patrick@wsj.com

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