What had been taken to be a dissident republican bomb found near Dundalk, Co Louth, late last month, has now turned out to be a cache of illegal amphetamine.
A rucksack containing 5kg of powder had been discovered on waste ground at Killin.
Gardaí called in army bomb disposal experts who said the substance was ammonium nitrate – home-made explosives.
They removed the material for further testing.
At the time there was concern that the 'explosive' was being prepared by dissident republicans for an attack which could have dealt a major blow to the Northern Ireland peace process.