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Police Commissioner: Third explosion at JFK Library

Boston Police Commissioner Edward Davis has told reporters there were three separate explosions in Boston - the first two near the finish line of the marathon and a third at the John F. Kennedy Library in the city.

He said that police were treating the explosions as related.

Here is an excerpt from the briefing he just gave to reporters:

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Linking library fire and marathon explosions 'pure speculation'

The JFK Library in Boston has tweeted to say that there was fire in the building which has now been extinguished and that it is "pure speculation" to link it with the Boston Marathon explosions:

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Broken glass and debris at Boston Marathon finish line

The windows of the buildings surrounding the finish line of the Boston Marathon were broken and debris was scattered across the ground after a reported explosion.

Emergency workers near the scene of the reported explosion Credit: EBU
Someone hurt in the incident is carried away in a stretcher Credit: EBU
People help the wounded Credit: EBU