Two explosions at the finishing line of the Boston Marathon killed at least three people and left at least a dozen more injured, according to news reports. Law enforcement officials said they were caused by small, home-made bombs.

Photos and videos posted within minutes by witnesses showed scenes of chaos and bloodshed, with emergency services swarming the scene on Boylston street and smoke billowing into the sky.

The organizers of the Boston Marathon reported that two bombs detonated seconds apart, about three hours after the front-runners crossed the finishing line. A third device was destroyed later in a controlled detonation. Flight restrictions were in force late Monday afternoon.

The death toll looks set to rise, with some sources already reporting many more dead, and police still working to evacuate streets near where the explosions took place.

Updates below, timestamps in Eastern.

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