Understand the source but then this does tie Iran to Yemen....
One of the ways they linked the Qasef-1 drone being used in Yemen to Iran's Ababil-II variant UAVs is by its vertical gyroscope, here.....
That vertical gyroscope has been seen in Iran's Ababil-3 UAV. A few weeks ago, ISIS showed off a captured Ababil-3 in Iraq. Screenshots:
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