Bombs where pressure cooker bombs, a favorite of pakistani taliban.
I already have a 100$ bet with an overly patriotic, Islamophobe ''friend'' (more like an aquaintance). I think that it was domestic terrorism. White supremacists and other extremist groups have circulated copies of Al Quaeda bomb diagrams on their web forums. They have found these manuals beneficial in their strategies. Let us not jump to conclusions.