That means one of three things:
- We don’t know who attacked the Boston Marathon yet.
- We do know, we have the perpetrator in custody, and we’re in the process of getting the rest of his network from him*.
- We do know, we have the perpetrators under observation, and we’re getting ready to roll up their entire network.
There’s a bunch of other, very low-probability scenarios, but I don’t do conspiracy theories under circumstances like these. All said, we’ll know when we know; and it beggars belief that the Obama administration is just going to let somebody target a national event and get away clean.
*If this is the correct scenario, then I assure you: somewhere within the perpetrator’s field of vision lies several gallon jugs of water, and several towels. Just to focus the man’s mind.