David, sigh... I can't talk about the source, but consider this 'first hand': more than 300 Kurds were recruited for the Daesh alone in Evin Prison, in Tehran, in 2013.
So, somebody talking about '70'.... that's as silly as declaring majority of Kurds for 'secular'. Vast majority of Kurds are Sunni Moslems (even Wikipedia 'knows' this).
That is: except your source meant, '70 from specific village/minor town', of course.
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EDIT: the Austrian Ministry of Interior has published its data on Austrians that joined the Daesh so far.
154 went there, 64 came back, some 20+ are known to have been killed so far.
Anybody there seriously attempting to sell the story there are less Kurds fighting for the Daesh than Austrians...?
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