Channel 4 is reporting that there were two consecutive explosions near the finish line of today's Boston Marathon. One was near the Marathon Sports store at 671 Boylston; the other was further down Boylston closer to Mass. Ave.
The windows of the Marathon Sports store at 671 Boylston were blown out by the explosion.
An eyewitness told Channel 5 that the explosion at Marathon Sports was "an absolute ball of fire" and appeared to have come from inside the store.
From Justin Rice:
Andrea Storer from Connecticut, speaking in the lobby of the Fairmont Copley Plaza hotel, said she was about a block away when she heard two explosions.
"A big explosion, huge explosion right near the finish line," she said through tears. "It was huge. There had to be people killed. There had to be. It was a huge explosion. It was the loudest noise, and all the smoke. Two went off."
Because of the massive number of medical personnel in the Boston Marathon medical tent for today's race, the injured were taken there for treatment.
A video of the first explosion near Marathon Sports shows that the blast was loud and quite smoky. The Boston Marathon finish line clock was displaying 4:09:51. Runners on the course there clearly jumped and ran to the side away from the explosion.
WBZ reporting at least 15 to 20 people seriously injured at explosion site.
Boston.com sports producer Steve Silva was near the finish line when the explosions occurred near the intersection of Boylston and Exeter streets.
"I was there at the finish, shooting finish line scenes, and then bang, it just went off, and then less than 15 to 20 seconds after there was a second explosion, closer to Fairfield street," Silva said.
"It was just immediately [evident] there were injuries, right in the middle of the spectator crowds. There was blood everywhere, there were victims being carried out on stretchers. I saw someone lose their leg, people are crying, people are confused."
"It was just an explosion, it came out of nowhere. There are multiple injuries. I saw dismemberment, I saw blood everywhere. People are badly injured."