'No unexploded bombs at Boston Marathon'

Massachusetts governor Deval Patrick says no unexploded bombs were found at the Boston Marathon. He says the only explosives were the ones that went off on Monday.

Massachusetts governor Deval Patrick says no unexploded bombs were found at the Boston Marathon. He says the only explosives were the ones that went off on Monday.

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Three people were killed, including an 8-year-old boy, and more than 150 injured by two explosions just seconds apart near the finish line on Monday.

Special agent in charge Richard DesLauriers says there are no known additional threats and agents are following a number of leads.