Ten people have been arrested in a suspected £4m VAT and money laundering fraud linked to the transport industry.
Addresses in Cambridgeshire, Yorkshire, Essex, Surrey and Counties Tyrone and Down were raided by police and HM Revenue and Customs (HMRC) officers.
A spokesman said computers, mobile phones and cash were seized during the raids.
The nine men and one woman have been questioned and released on bail until November.
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