During the war Aäron van Hoorn was interned in labour camp Fochteloo, after which he was deported to the East via Westerbork.
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The story of Aäron van Hoorn is described in the book Jodenkampen : ter nagedachtenis aan de joodse dwangarbeiders die vanuit de werkkampen werden afgevoerd en later door de nazi's zijn vermoord (Kampen 2007) p. 352 etc. by N. van der Oord