Their crime?
In Islamic law, a woman is divorced before she can be remarried (so that there is no doubt as to the parentage of any children she has - this was taken from Jewish law but claimed by Muslims to be one of their innovations.)
A father in Syria married his daughter to a young man before the three months were complete.
So the Islamists who control the town gave both the father and the groom a public flogging, apparently with electrical wire, after reading their verdict.
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