The first explosion came at about 14:50 local time (18:50 GMT), approximately two hours after the winners crossed the line. Currently the following has been reported:
- Two explosions at the finish line of the Boston Marathon have left at least two dead and 23 injured.
A third bomb exploded near the library.This was a fire and is thought to have been unrelated. Investigations are continuing.
- Police have found and are dismantling at least two other explosive devices.
- President Obama is now due to speak at 18:10 EDT (23:10 BST).
- House Speaker John Boehner is scheduled to lead a moment of silence on the floor of the House of Representatives at 18:30 EST (23:30 GMT).
- Boston police say they have found no further explosive devices. 19:50 EST ( 00:50 GMT)
- Police say they cannot estimate the precise numbers of injured people. The Associated Press believe it to be over 100.
Boston's Mayor Tom Menino has arranged a telephone hotline for worried friends and relatives: +1-617-635-4500.
Google have created a person finder to help find missing people. http://google.org/pe...ton-explosions/
Politicians have been making their statements 20:02 EST (01:02 GMT)
Australian Prime Minister Julia Gillard
"Australians have awoken this morning to shocking and tragic scenes at the Boston Marathon. It will be some time before we know the full extent of what has occurred but these explosions have cast a long shadow over one of the world's great sporting events."
The Governor of Massachusetts, Deval Patrick
"We ask that most people make their way calmly home and, if they are visiting the city, back to their hotels."
Scottish First Minister Alex Salmond
"It is clear from the reports and horrific pictures from the scene that a number of people have lost their lives and many more have been injured in what can only be described as cowardly attacks on innocent people simply out enjoying the fun of a marathon on Patriot's Day."