Four people have been arrested as part of a major crackdown on money-laundering and insurance fraud.
The suspects, two men aged 21 and 34 and two women both aged 26, were detained in Ballymena and Antrim today.
They are being questioned by detectives from the Police Service of Northern Ireland's (PSNI) organised crime branch about alleged money laundering.
A spokesman for the PSNI said the investigation was expected to continue for some time.
" Today's arrests are linked to the money-laundering side of the investigation," he said.
Since May, 23 people have been arrested and questioned as part of the inquiry.