The Bank of England was sucked deeper into the sprawling investigation into global currency markets when it announced Wednesday that it has suspended a staff member in relation to the matter.

In a statement, the central bank said it has so far reviewed 15,000 emails, 21,000 chat-room messages and more than 40 hours of telephone-call recordings in an effort to discover whether its staff have acted inappropriately in the currencies market. It said that to date, it has found "no evidence" that its staff "colluded in any way in manipulating the foreign exchange market or in sharing client information." However, it has suspended a staff member, whom it hasn't identified, pending further investigation.