A former Citigroup Inc. trader is among three people held in the first U.K. arrests as part of global probes into tampering with the London interbank offered rate, according to two people familiar with the matter.

Thomas Hayes, a former trader at UBS AG and Citigroup, was arrested by the Serious Fraud Office and City of London Police today, said the people, who asked not to be identified citing the continuing investigation. The other two men arrested worked at brokerage firm RP Martin Holdings Ltd., according to one of the people and a third person familiar with the investigation, who also requested anonymity.

The three men, ranging in age from 33 to 47, are all British nationals living in the U.K. and were taken to a London police station for questioning, the SFO said in an e-mailed statement.

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