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This is either a copycat OR (hear me out) - Wahhabists are very much against educating women; could they be recruiting homeless nutjobs to do their dirty work for them?
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If it's a copycat, then it just proves that it would not have happened but for the media coverage of the first killings.
The guys who do this are just looking for media attention.
A little early for speculating on links to islamists, but I'm sure they're taking notes on all these incidents.