The evidence leads us to believe the acts are either a foreign or domestic terrorist whose motivations are either unclear or are being concealed from the law enforcement authorities. There is also a preponderance of evidence to imply that there is actually a team committing the crimes and that it is not a single individual.
The analysis has lead us to the mostly likely hypothesis that the attacks were carried out by a terrorist with only a thin line between Domestic or Foreign. The milestones that would lead us to one or the other would be: