Detectives investigating paramilitarism have seized £3,000 after stopping a vehicle on the M1 motorway.
It happened on the eastbound carriageway on Sunday and is believed to involve suspected republicanism.
A PSNI detective inspector said: "Our operations will continue into paramilitary groups and they can expect no let-up in our focus regarding their criminality."
The operation was carried out by the PSNI's Paramilitary Crime Task Force and the cash held under the Proceeds of Crime Act.
The PSNI, HMRC and the National Crime Agency established the task force as part of the former Stormont executive's action plan on tackling paramilitarism.
