CUSTOMS officers and gardaí have raided a diesel laundering plant in Co Monaghan, close to the Armagh border.

The plant at Drumboat, Inniskeen had the capacity to launder 20 million litres of diesel a year.

That equates to a potential loss to the Exchequer of €10m in excise and duties.

One man in his 40s was arrested in relation to breaches of environmental waste legislation.

The overnight operation was supported by armed gardaí.

Customs officials described the seizure as “significant”.