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.