The night of the bombing, I knew that the perpetrators were Muslim based upon the fact that the media and the Obama administration were not leaking that it was by a Timothy McVeigh type.
It was reinforced by the fact that when suspects were identified, their religion was not identified prominently if at all.
If the bombing was perpetrated by a TEA Party activist as was speculated because it happened on April 15, this would have been trumpeted by the media ad nauseum continuously ever since.
Bear in mind also that the media started going into the life-stories of the bombers right away.
Compare this to how the mass-murders in Newtown CT and Aurora CO were treated in the media. The difference being is that these were shootings, so the issue was gun-control rather than what sort of people were pulling the triggers.
In these cases, the shooters were victims, according to the Left, because they were forced to perpetrate these atrocities by the availability of firearms to the general public.
The bombers, on the otherhand, were motivated by justifiable outrage perpetrated by the United States’ unfair treatment of Muslims — according to the Left.