Boston Marathon hit by explosions

 

Two explosions at the finish line of the Boston Marathon race have left an unknown number of people injured.

Video and photographs from Boston show a scene of confusion, with emergency services descending on the scene and bloodied spectators being taken to a medical tent.
"There are a lot of people down," said one runner quoted by AP news agency.
The incident reportedly came about three hours after the winners crossed the line.
AP said there was a loud explosion on the north side of Boylston Street, just before the bridge that marks the finish line. Another loud explosion could be heard a few seconds later.
Stragglers heading for the finish line were rerouted away from the smoking site of the blasts.
The Eastern Massachusetts branch of the Red Cross has set up a disaster response centre in the area.