A raid at commercial premises in Armagh city resulted in one man being bailed and instructed to appear at Armagh police station on August 6.
During the seizure five HGV cabs were taken away for further inspection.
Officials made their second find after stopping a fuel tanker in south Armagh. The tanker was carrying 10,000 litres of allegedly laundered fuel.
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The raids come as fuel prices across Ireland continued to soar and, last month, the NI Security Minister announced a cross border task force aimed at tackling the illegal fuel trade.
Meanwhile, one of the world's leading chemical firms has said cars fuelled by household waste could become a reality within three years,
INEOS is currently working on producing commercial quantities of bioethanol fuel from biodegradable municipal waste.
The process burns the biodegradable waste and produces ethanol by mixing a biological catalyst with carbon monoxide and hydrogen.
The company believes is has all the resources and knowledge needed to take its work to a commercial level.
(PR)
