The Financial Services Authority (FSA) has arrested eight people in connection with a major investigation into alleged insider dealing.
Searches were carried out at a number of addresses across London and the south-east of England.
The operation involved 40 FSA staff and a number of officers from the City of London police.
The FSA said it was part of its work to combat market abuse. No further details were released.
Insider dealing carries a maximum sentence of seven years in prison.
As the financial services regulator, the FSA has powers to investigate and prosecute insider dealing.
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