12:40 PM PT: Shephard Smith speculating about the possibility of the explosion having come from a trash can based on a report from a reporter covering the race.
12:44 PM PT: Via MSNBC, Boston's NBC affiliate is saying the explosions took place outside buildings.
12:53 PM PT: Boston Marathon statement refers to "bombs" according to Boston's NBC affiliate.
12:55 PM PT: It appears Boston PD may be detonating another device:
1:00 PM PT: New report: 12 dead.
1:06 PM PT: Other media outlets aren't running with that report of 12 dead. Apparently local TV is saying two are dead, so it's still very unclear what the true story is. Hopefully the bigger number turns out to be wrong.
1:07 PM PT: Boston Globe says two:
1:08 PM PT: MSNBC says officials tell it there was "at least one small improvised explosive device."1:10 PM PT:
1:12 PM PT: Apparently Secret Service on high alert: