At least two devices have exploded near the finish line of the Boston Marathon. Boston Police say at least three people were killed, and over 140 were injured. A third incident at the JFK library in Dorchester appears to be fire related.
A source notes that the time of the explosions coincided with the time that the most people cross the finish line.
A law enforcement source tells FOX that they are treating this as a terrorism investigation, though it's unclear whether that means domestic terrorism and international terrorism.
Marathon organizers confirmed on Facebook that two bombs exploded near the finish line and they are working with authorities. The race was suspended and the 26.2-mile course evacuated.
Video from the scene shows shattered glass littering the sidewalk, with numerous people with bloody injuries laying just behind security barriers that line the street.
President Obama has directed his administration to provide whatever assistance is necessary in the investigation and response. Vice President Biden was on a conference call when word began coming in about the explosions through the television. The Vice President stopped his conference call and offered prayers to the victims. Attorney General Holder has directed the full resources of the Justice Department to be deployed to ensure this matter is fully investigated.
LISTEN to sounds from the scene as one of the bombs explodes:
WATCH more on this breaking news:
Stay tuned to your local FOX News Radio station for more on this breaking news.