Austrian "Lone Wolf" Cubs Get Up to Some Jihadi Hijinks

Seems to me they're getting younger and younger (my bolds):

An Austrian teenager arrested on suspicion of planning an Islamist attack in Vienna has told investigators he built a "test bomb" in Germany, where another suspect has been arrested, Austria's interior minister was quoted as saying on Tuesday. 

The Austrian suspect, a 17-year-old with Albanian roots, was arrested on Friday after tip-offs from unspecified foreign countries. Austria alerted Germany to a related suspect, a 21-year-old who was arrested in the western city of Neuss on Saturday. A boy thought to be 12 has also been held in Austria. 

Whether the German and Austrian suspects are believed to have planned separate attacks or a joint one, and of what nature, is not clear. Austria has said public places in Vienna including its underground transit system might have been a target.  

"A test bomb seems to have been put together," Austrian Interior Minister Wolfgang Sobotka told broadcaster ORF, even though no explosives were found in the apartment in question. "That is all we can announce today from the questioning."