It is also true that while no organization has yet taken credit for the bombing as far as I know, radical Islamic web forums have applauded it.
The fact that the explosive is low-grade, non-military material means that a lone-wolf or very small group of terrorists could have carried it out.
In short, based on the information that’s public at this point, it’s not possible to deduce the motive or the likely class of perpetrator. But if I were a betting man, my first guess would be a single Muslim terrorist or a very small group of same.
Here’s a picture of what’s left of a pressure cooker that held a bomb. You can be sure the FBI will be checking the stores — everywhere.
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