ZURICH/NEW YORK (Reuters) – U.S. prosecutors charged two former UBS traders on with taking part in a multi-year scheme to manipulate Libor and other benchmark interest rates, making them the first individuals to be criminally accused in the international scandal.

The charges against the two traders, Tom Hayes and Roger Darin, resulted from a broad investigation into the activities of more than a dozen banks in the setting of prices for Libor and related rates.

A day after UBS agreed to pay $1.5 billion to regulators in the United States, UK and Switzerland, the Hong Kong Monetary Authority (HKMA) said the bank was being probed over its submissions of interbank rates there, raising the risk it could face more fines.

In settling with U.S., UK and Swiss authorities, UBS not only paid one of the largest fines ever imposed on a bank, its Japanese subsidiary pleaded guilty to one U.S. criminal count of fraud relating to manipulation of benchmark rates, including the yen Libor.

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