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This is not an ISIS salute either
This is not an ISIS salute being made by islamic convert Mert Ney just before he was apprehended by a group of brave passers by and firemen before the NSW police caught up with them.
It's just the sort of everyday gesture of devotion to Allah that anybody would make, just after they have murdered an infidel woman by slitting her throat and stabbed at least one more, while yelling Allahu Akbar and brandishing a blood-stained knife.
Nothing to cause concern.