Not much in the way of details, but multiple reports on Twitter suggest some sort of explosion at the finish line area of today's Boston Marathon:
12:08 PM PT:
12:09 PM PT: The twin explosions came from the Fairmont Copley hotel according to the AP.
12:10 PM PT:
BREAKING NEWS: Two powerful explosions detonated in quick succession right next to the Boston Marathon finsh line this afternoon.
— @BostonGlobe via HootSuite
12:11 PM PT:
Video of two explosions at #BostonMarathon finish line. We can't see what's happening from inside the press center
http://t.co/...
— @caitlingiddings via web
12:15 PM PT: This appears to be a photo of the explosion:
Explosion at the Boston Marathon. #bostonmarathon Media locked down at nearby hotel.
http://t.co/...
— @907RAVFM via web
12:17 PM PT:
12:20 PM PT: WBZ Boston says the explosions were on Boylston Street near viewing stands. One was near a Marathon Sports store.
12:24 PM PT: It looks like the explosion at the Marathon Sports at Boylston Street happened at around the 4:09 mark of the race.