Michaela Schnell, director of public prosecution for St. Pölten, confirmed the arrest on Tuesday, according to the Austrian Press Agency (APA).
Currently, police and prosecutors are actively investigating the case, and refuse to comment further.
The Kronen Zeitung newspaper reported that the boy was actively seeking to connect with other jihadists, and had plotted to blow up Vienna's Westbahnhof railway station by researching how to make a bomb on the internet.
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The boy is confirmed to be an Austrian citizen.