Boston Police say at least three people have died and more than 100 injured when two explosions went off in quick succession as runners were finishing the 117th edition of the Boston Marathon.
The cause of the explosions, which occurred about two hours after the winners crossed the line, was not immediately known. Competitors and race volunteers were seen crying as they fled the scene and bloody spectators were being treated at the medical tents set up to assist fatigued runners.
Spectators heard two loud booms near the finish line inside the Fairmount Copley Plaza Hotel and race officials moved to lock down the hotel. The first explosion was reported on the North side of Boylston Street by the finish line and a second one went off a few seconds later.
An intelligence official told the AP that two more explosive devices were found at the marathon and were being dismantled. The Boston Marathon was established in 1897 and attracts an estimated 500,000 spectators and runners every year. The local CBS affilate in Boston has a live feed of the scene that can be looked at here. Get the full story here and track the latest developments here.