Boston Marathon Explosion: 2 Large Explosions Near Finish Line

The above image is believed to be a photo of one of the two explosions that went off at the finish line at the Boston Marathon today. The explosion happened just near the sidewalk, there have been at least 12 people have been injured. CBS is reporting that no one is claiming any responsibility for this event, but how it happened or why it happened is not known. Police have cordoned off the Lenox Hotel near the finish line where the explosion originated.