Police are probing allegations of illegal dumping and laundering
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Three people arrested in connection with illegal dumping, money laundering and the theft of industrial equipment have been released.
One received bail and the other two have been released pending reports, said police.
Three are still being questioned by police. Six people were arrested on Tuesday as part of a police operation.
They were arrested as part of an investigation into the work of an organised criminal gang.
A total of 18 locations were raided in north Antrim, Fermanagh, Belfast and Derbyshire as part of the operation.
A team from Queen's University in Belfast assisted the police at the search sites in Fermanagh.
It used specialist ground radar technology designed to locate deeply buried material.
The operation followed an investigation into illegal dumping in both Northern Ireland and the Republic of Ireland going back a number of months.
Last November, police investigating illegal dumping in Derrylin recovered stolen goods worth about £200,000.