Massachusetts Gov. Deval Patrick says no unexploded bombs were found at the Boston Maratho. He says the only explosives were the ones that went off Monday.
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 Monday.
Authorities are appealing to the public for amateur video and photos that might yield clues to who carried out the bombing.
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