Breaking News: Explosion At Boston Marathon

Details are sketchy right now, but there have been two explosions at the finish line of the Boston Marathon.

There have been at least a dozen people injured.  No word on number of deaths, if any.  Residents and runners are being urged to stay away from garbage cans and trash receptacles.

It is not clear if this was an act of terrorism and no group has claimed responsibility.

Watch live coverage HERE from the CBS affiliate in Boston.

Here is a picture from the finish line at the moment of the explosion, from Twitter user https://twitter.com/danroan.