High-grade explosives were planted on an airline passenger

It has been confirmed that a small quantity of high-grade explosives found today in a Dublin apartment originated in Slovakia and was smuggled into the country as part of a security exercise gone wrong.

The Slovakian government has apologised for the incident and a full investigation is underway...

It is believed the explosives were planted in the Slovakian man's luggage as he returned home to Dublin last Saturday after the Christmas break.

Some 100g of what is known as RDX explosive - enough to down an airplane - went through the flight undetected...

"It has since been established that this material was concealed without his knowledge or consent in the passenger's luggage as part of an airport security exercise by the authorities in Slovakia.

Further details at the Irish Examiner.  Via Reddit, where there is a discussion thread.