An oil laundering plant has been discovered in Co. Monaghan.

It has the capacity to process 2 million litres of fuel every year.

Officers from the Revenue Custom Service and local gardaí made the find today at Clontibret.

The plant represented a potential loss to the exchequer of €1 million per annum.

10,000 litres of laundered fuel, 9 bags of bleaching agent, a car and a van were all seized at the site.

Officers also discovered 8 tonnes of toxic sludge.

The discovery came as the result of a Revenue surveillance operation.

Enquiries in relation to the find are on-going.

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