An oil laundering plant that could produce 12 million litres of illegal fuel a year has been uncovered in Co Louth.
Officers from Revenue's Customs Service and Gardai made the discovery in Courtbane, Hackballscross.
Two men in their late 20s were arrested - one with a Dublin address and the other a home in Northern Ireland.
The plant, which was found hidden behind a curtain in a 40ft trailer, could cost the Exchequer an estimated six million euro a year.
Officers also uncovered a mobile laundering plant in a van, containing two tankers and 25,000 litres of product.
A substantial amount of toxic waste was also found at the site.