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Two explosions hit the Boston Marathon as runners crossed the finish line on Monday, killing at least two people and injuring 23 on a day when tens of thousands of people pack the streets to watch one of the world's best known marathons.

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In this image from video provided by WBZ TV, spectators and runners run from what was described as twin explosions that shook the finish line of the Boston Marathon, Monday, April 15, 2013, in Boston.WBZTV/The Associated Press

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Injured people and debris lie on the sidewalk near the Boston Marathon finish line following an explosion in Boston, Monday.Ken McGagh

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Injured people and debris lie on the sidewalk near the Boston Marathon finish line following an explosion in Boston.Ken McGagh

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A Boston Marathon competitor and Boston police run from the area of an explosion near the finish line in Boston, Monday.Ken McGagh

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A Boston police officer clears Boylston Street following an explosion at the finish line of the 2013 Boston Marathon in Boston, Monday.Charles Krupa/The Associated Press

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Two Boston Marathon volunteers hug each other, at right, as an injured person is loaded into an ambulance in the aftermath of two blasts which exploded near the finish line of the Boston Marathon in Boston, Monday.Elise Amendola/The Associated Press

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Medical workers aid injured people at the finish line of the 2013 Boston Marathon following an explosion Monday.Charles Krupa/The Associated Press

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Boston police clear an area following an explosion near the finish line of the 2013 Boston Marathon in Boston, Monday.Charles Krupa/The Associated Press

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Medical workers aid injured people at the finish line of the 2013 Boston Marathon following explosions in Boston, Monday.Charles Krupa/The Associated Press

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Medical personnel work outside the medical tent in the aftermath of two blasts which exploded near the finish line of the Boston Marathon in Boston.Elise Amendola/The Associated Press

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Ambulances line the street after explosions reportedly interrupted the running of the 117th Boston Marathon in Boston, Massachusetts.Dominick Reuter/Reuters

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Boston Police coordinate the scene after explosions reportedly interrupted the running of the 117th Boston Marathon in Boston.Dominick Reuter/Reuters

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Medical workers aid injured people at the finish line of the 2013 Boston Marathon following an explosion in Boston.Charles Krupa/The Associated Press

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A child is comforted after explosions went off at the 117th Boston Marathon in Boston, Massachusetts April 15, 2013.Jessica Rinaldi/Reuters

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A Boston police officer wheels in injured boy down Boylston Street as medical workers carry an injured runner following an explosion during the 2013 Boston Marathon in Boston, Monday, April 15, 2013.Charles Krupa

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A woman is comforted by a man near a triage tent set up for the Boston Marathon after explosions went off at the 117th Boston Marathon in Boston, Massachusetts April 15, 2013.Jessica Rinaldi/Reuters

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Medical workers wheel the injured across the finish line during the 2013 Boston Marathon following two explosions in Boston, Monday, April 15, 2013.Charles Krupa/The Associated Press

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Medical workers aid injured people at the finish line of the 2013 Boston Marathon following an explosion in Boston, Monday, April 15, 2013.Charles Krupa/The Associated Press

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Still image taken from video courtesy of NBC shows the scene of an explosion at the Boston Marathon, April 15, 2013.NBC/Reuters

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Medical workers aid injured people at the finish line of the 2013 Boston Marathon following an explosion in Boston, Monday, April 15, 2013.Charles Krupa/The Associated Press

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Medical responders run an injured man past the finish line the 2013 Boston Marathon following an explosion in Boston, Monday, April 15, 2013. Two explosions shattered the euphoria of the Boston Marathon finish line on Monday, sending authorities out on the course to carry off the injured while the stragglers were rerouted away from the smoking site of the blasts.Charles Krupa/The Associated Press

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Still image taken from video courtesy of NBC shows the scene of an explosion at the Boston Marathon,NBC/Reuters

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