No doubt that there is already lots of speculation as to who was behind it and remember, in 1995, there was lots of people pointing fingers at Islamic terrorists until it was determined that it was good old angry white dudes.
I'm tempted to joke that since the Boston Marathon takes place on the day that Patriots' Day is observed, maybe the cops ought to be looking for Loyalist sympathizers. But it wouldn't be amusing, not today.
UPDATE: 3 dead, 141 wounded. I'm not the only one who looked at the copious amount of smoke and thought about black powder.