Boston Marathon Terrorist Attack: VIDEO, PHOTOS Shock Nation - Bombings Kill 2, Injure More Than 100

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(Photo: Reuters/Neal Hamberg)Public safety officials evacuate the scene after several explosions near the finish line of the 117th Boston Marathon in Boston, Massachusetts April 15, 2013. One or more bombs were responsible for the explosions that struck the Boston Marathon as runners crossed the finish line, two high-level law enforcement sources told Reuters.

The Boston Marathon bombings have been confirmed as a terrorist attack Monday afternoon, according to the FBI. Two explosions hit near the marathon finish line just before 3 p.m. ET, killing at least two, and injuring more than 100, according to latest reports.

A third "incident" at the JFK Library in Boston is at this time now believed to be unrelated to the Boston Marathon incident. Reports of a fire or explosion in the library had initially sparked fears of a third bomb.

The White House also confirmed that President Barack Obama would address the nation briefly at about 6.10 p.m. ET.

At a new conference held just before 5 p.m. ET, Boston Police Commissioner Ed Davis, confirmed that a third incident had been reported at the library Monday afternoon but that it was not confirmed as related. Earlier reports of a fourth device seemed to be ruled out.

Davis also confirmed that as of 6 p.m. ET no suspects had been apprehended and it was still not know who was behind the attacks.

The devastating scenes at the Boston Marathon have shown injured people being carried away from the scene of the explosions, which took place near the finish line of the marathon route.

Witnesses reported that two loud bangs were heard near the finish line, and video footage can be seen at the moment of the explosions with a big fireball seen coming from one of the buildings to the side of the road.

The two explosions at the marathon were heard about 10 to 15 seconds apart, with some reports describing a ball of flames coming out from the Marathon Sports store near the finish line.

Other early reports are claiming more injuries are expected to be reported. Some reports have claimed that some bloodied victims were taken to a medical tent for treatment, and many others have been taken to hospital. Some of those being treated in hospital are said to have suffered critical injuries and have been taken immediately to the emergency room.

Early video footage has shown chaotic scenes at the location, with some people being blown off their feet when the explosion took place, and massive amounts of smoke seen filling the streets where the explosions hit.

Huge amounts of smoke could be seen coming from the Marathon Sports store and marathon officials were seen pulling at some metal railings that were twisted and piled on the ground, seemingly to free some people under them.

Other eye witnesses reported a bloody scene, with some victims being very seriously injured near the scenes of the explosions.

Police are being deployed to major landmarks in other large cities across the United States, including New York City, as fears of a possible terrorist attack emerge.

President Obama has been notified and he will now remain in constant contact with officials at the scene and has promised to offer any assistance needed in the aftermath of the incident.

Here is video footage in the aftermath of the bombings: