Gee, who might be motivated to set off a bomb on Christmas morning?
[Update a while later]
Police swept apartment buildings before the explosion, perhaps saving many lives. I wonder if there was a tip?
[Update a couple minutes later]
Steven Kruiser is collecting links.
[Late-afternoon update]
Thoughts from Glenn Reynolds.
Yes, it does look like a rehearsal for an infrastructure attack. Or was it AT&T that was the target?
[Saturday-morning update]
A speculative Twitter thread.