Britain’s Barclays bank has suspended six traders, the Financial Times reported on Friday, as an international investigation of currency market manipulation deepened.

The bank said this week that it was cooperating with regulators in the investigation and it was reviewing its foreign exchange trading over several years until this August.

None of the traders, who included its chief currency trader in London, had been formally accused of anything and were not solely based in London, the newspaper reported, citing two unnamed sources familiar with the investigation.

Deutsche Bank, Citigroup, JP Morgan and UBS are among other major banks that have confirmed they are being investigated by regulators.

Media reports earlier on Friday said RBS had also suspended two of its traders. A senior trader at Standard Chartered was also reported to have been suspended this week because of his previous work at UBS and Barclays.

Authorities in Britain, the United States and Switzerland are among those who have begun investigations into the currency market, which is worth about $5 trillion a day globally.

The investigation follows closely after a scandal over the rigging of the Libor interbank lending rate. Barclays, UBS and RBS are among the five financial institutions that have been fined for their part in the scam.

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